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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