21=2x+5(-2x-7)

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Solution for 21=2x+5(-2x-7) equation: 



21=2x+5(-2x-7)

We move all terms to the left:

21-(2x+5(-2x-7))=0



We calculate terms in parentheses: -(2x+5(-2x-7)), so:

2x+5(-2x-7)

We multiply parentheses

2x-10x-35

We add all the numbers together, and all the variables

-8x-35

Back to the equation:

-(-8x-35)



We get rid of parentheses

8x+35+21=0

We add all the numbers together, and all the variables

8x+56=0

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

8x=-56

x=-56/8

x=-7

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