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Marat540 [252]
3 years ago
8

Solve the equation for x 3x+9x = 6x + 42

Mathematics
1 answer:
podryga [215]3 years ago
3 0

= 3x + 9x = 6x + 42

= 3x + 9x - 6x = 42 ( transposing +6x from LHS to RHS changes +6x to -6x )

= 12x - 6x = 42

= 6x = 42

= x = 42 ÷ 6 ( transposing ×6 from LHS to RHS changes ×6 to ÷6 )

= x = 7

Let us check whether we have found out the correct value of x or not by placing 7 in the place of x :

= ( 3 × 7 ) + ( 9 × 7 ) = 6 × 7 + 42

= 21 + 63 = 42 + 42

= 84 = 84

= LHS = RHS

Hence proved we have derived the correct value of x .

Therefore , the value of x = 7 .

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saul85 [17]

x-2=7

apply additon property of equality

x-2+2=7+2

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3 years ago
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Answer:

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8 0
3 years ago
[6x4(15/5)[+[2^2+(1x-5)]
Vikki [24]

Answer:

71

Step-by-step explanation:

[6x4(15/5)]+[2^2+(1x-5)]

BIDMAS (aka PEDMAS etc.)

Brackets

Indices

Division/Multiplication

Addition/Subtraction

[6 x 4(15/5)] + [2^2 + (1x-5)]

[6 x 4(3)] + [2^2 + (-5)]

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72 + [-1]

72 + - 1

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71

6 0
3 years ago
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sineoko [7]

Answer:

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Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
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Citrus2011 [14]

Answer:

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Step-by-step explanation:

First: add 24and 30 to get 54

Second: subtract 54 from 90

Third: then you get 36 as an answer

6 0
3 years ago
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