12+7(x-4)+3x=84

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Solution for 12+7(x-4)+3x=84 equation: 



12+7(x-4)+3x=84

We move all terms to the left:

12+7(x-4)+3x-(84)=0

We add all the numbers together, and all the variables

3x+7(x-4)-72=0

We multiply parentheses

3x+7x-28-72=0

We add all the numbers together, and all the variables

10x-100=0

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

10x=100

x=100/10

x=10

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