-91=-4x-9x

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Solution for -91=-4x-9x equation: 



-91=-4x-9x

We move all terms to the left:

-91-(-4x-9x)=0

We add all the numbers together, and all the variables

-(-13x)-91=0

We get rid of parentheses

13x-91=0

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

13x=91

x=91/13

x=7

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