84=2*x+x+12

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Solution for 84=2*x+x+12 equation: 



84=2x+x+12

We move all terms to the left:

84-(2x+x+12)=0

We add all the numbers together, and all the variables

-(3x+12)+84=0

We get rid of parentheses

-3x-12+84=0

We add all the numbers together, and all the variables

-3x+72=0

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

-3x=-72

x=-72/-3

x=+24

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