90=x+42+3x

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Solution for 90=x+42+3x equation: 



90=x+42+3x

We move all terms to the left:

90-(x+42+3x)=0

We add all the numbers together, and all the variables

-(4x+42)+90=0

We get rid of parentheses

-4x-42+90=0

We add all the numbers together, and all the variables

-4x+48=0

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

-4x=-48

x=-48/-4

x=+12

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