-91=-7(10+x)

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Solution for -91=-7(10+x) equation: 



-91=-7(10+x)

We move all terms to the left:

-91-(-7(10+x))=0

We add all the numbers together, and all the variables

-(-7(x+10))-91=0



We calculate terms in parentheses: -(-7(x+10)), so:

-7(x+10)

We multiply parentheses

-7x-70

Back to the equation:

-(-7x-70)



We get rid of parentheses

7x+70-91=0

We add all the numbers together, and all the variables

7x-21=0

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

7x=21

x=21/7

x=3

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