91=-2(-2+5x)+7

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Solution for 91=-2(-2+5x)+7 equation: 



91=-2(-2+5x)+7

We move all terms to the left:

91-(-2(-2+5x)+7)=0

We add all the numbers together, and all the variables

-(-2(5x-2)+7)+91=0



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

-2(5x-2)+7

We multiply parentheses

-10x+4+7

We add all the numbers together, and all the variables

-10x+11

Back to the equation:

-(-10x+11)



We get rid of parentheses

10x-11+91=0

We add all the numbers together, and all the variables

10x+80=0

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

10x=-80

x=-80/10

x=-8

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