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4 years ago

Solve for x. 5(-2x-3)-4x-5=78

Mathematics

2 answers:

Alisiya [41]4 years ago

6 0

Answer: X = -7

Step-by-step explanation:

5(-2x-3)-4x-5=78

We move all terms to the left:

5(-2x-3)-4x-5-(78)=0

We add all the numbers together, and all the variables

-4x+5(-2x-3)-83=0

We multiply parentheses

-4x-10x-15-83=0

We add all the numbers together, and all the variables

-14x-98=0

We move all terms containing x to the left, all other terms to the right

-14x=98

x=98/-14

x=-7

HOPED I HELPED

natka813 [3]4 years ago

4 0

Answer:

x=-7

Step-by-step explanation:

5(-2x-3)-4x-5=78

-10x-15-4x-5=78

-14x-20=78

+20 +20

-14x=98

-14 -14

x=-7

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Answer:

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The answer is:

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Step-by-step explanation:

We have the expressions:

$Q=7m+3n\\R=11-2m\\S=n+5\\T=-m-3n+8$

Now, we need simplify:

$Q-[R+S]-T$

We need to replace each term by the expressions:

$7m+3n-[(11-2m)+(n+5)]-(-m-3n+8)$

We need to remember the rule of signs:

$-/-=+$

$-/+=-$

$+/+=+$

With this in mind we solve the parentheses:

$7m+3n-[(11-2m)+(n+5)]-(-m-3n+8)$

$7m+3n-[11-2m+n+5]+m+3n-8$

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let's group common terms

$7m+3n-11+2m-n-5+m+3n-8\\7m+2m+m+3n-n+3n-11-5-8$

We must add and subtract common terms:

$7m+2m+m+3n-n+3n-11-5-8\\10m+5n-24$

The answer is:

$10m+5n-24$

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