90=12+3x

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Solution for 90=12+3x equation: 



90=12+3x

We move all terms to the left:

90-(12+3x)=0

We add all the numbers together, and all the variables

-(3x+12)+90=0

We get rid of parentheses

-3x-12+90=0

We add all the numbers together, and all the variables

-3x+78=0

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

-3x=-78

x=-78/-3

x=+26

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