91=13(-7x-42)

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Solution for 91=13(-7x-42) equation: 



91=13(-7x-42)

We move all terms to the left:

91-(13(-7x-42))=0



We calculate terms in parentheses: -(13(-7x-42)), so:

13(-7x-42)

We multiply parentheses

-91x-546

Back to the equation:

-(-91x-546)



We get rid of parentheses

91x+546+91=0

We add all the numbers together, and all the variables

91x+637=0

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

91x=-637

x=-637/91

x=-7

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