12+7(9)=x

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Solution for 12+7(9)=x equation: 



12+7(9)=x

We move all terms to the left:

12+7(9)-(x)=0

We add all the numbers together, and all the variables

-1x+91=0

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

-x=-91

x=-91/-1

x=+91

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