90=x+(3x+12)

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Solution for 90=x+(3x+12) equation: 



90=x+(3x+12)

We move all terms to the left:

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



We calculate terms in parentheses: -(x+(3x+12)), so:

x+(3x+12)

We get rid of parentheses

x+3x+12

We add all the numbers together, and all the variables

4x+12

Back to the equation:

-(4x+12)



We get rid of parentheses

-4x-12+90=0

We add all the numbers together, and all the variables

-4x+78=0

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

-4x=-78

x=-78/-4

x=19+1/2

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