90=4x+3x+12

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Solution for 90=4x+3x+12 equation: 



90=4x+3x+12

We move all terms to the left:

90-(4x+3x+12)=0

We add all the numbers together, and all the variables

-(7x+12)+90=0

We get rid of parentheses

-7x-12+90=0

We add all the numbers together, and all the variables

-7x+78=0

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

-7x=-78

x=-78/-7

x=11+1/7

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