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3 years ago

15/4 - 7x = 9 pls answer step by step fast

Mathematics

2 answers:

patriot [66]3 years ago

4 0

15/4-7x= 9

Move 15/4 to the other side. Sign changes from +15/4 to -15/4

15/4-15/4-7x= 9-15/4

-7x=9-15/4

Find the common denominator for 9 which is 4. Multiply by 4 .

9(4)= 36

36/4-15/4= 21/4

-7x= 21/4

Multiply by -1/7x on both sides

-7(-1/7)x= 21/4(-1/7)

Cross out 21 and -7 , divide by 7

21/7=3

-7/7=-1

3/4*-1/1= -3/4

Answer: -3/4

Ad libitum [116K]3 years ago

3 0

Answer:

x = - $\frac{3}{4}$

Step-by-step explanation:

Multiply through by 4 to clear the fraction

15 - 28x = 36 ( subtract 15 from both sides )

- 28x = 21 ( divide both sides by - 28 )

x = $\frac{21}{-28}$ = - $\frac{3}{4}$

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3 years ago

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Jet001 [13]

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Step-by-step explanation:

Solving a quadratic equation:

Given a second order polynomial expressed by the following equation:

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