90=5x+12+x

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Solution for 90=5x+12+x equation: 



90=5x+12+x

We move all terms to the left:

90-(5x+12+x)=0

We add all the numbers together, and all the variables

-(6x+12)+90=0

We get rid of parentheses

-6x-12+90=0

We add all the numbers together, and all the variables

-6x+78=0

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

-6x=-78

x=-78/-6

x=+13

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