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

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



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

We move all terms to the left:

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



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

-7x+5(x-7)

We multiply parentheses

-7x+5x-35

We add all the numbers together, and all the variables

-2x-35

Back to the equation:

-(-2x-35)



We get rid of parentheses

2x+35-21=0

We add all the numbers together, and all the variables

2x+14=0

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

2x=-14

x=-14/2

x=-7

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