90=3x+3x+15

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Solution for 90=3x+3x+15 equation: 



90=3x+3x+15

We move all terms to the left:

90-(3x+3x+15)=0

We add all the numbers together, and all the variables

-(6x+15)+90=0

We get rid of parentheses

-6x-15+90=0

We add all the numbers together, and all the variables

-6x+75=0

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

-6x=-75

x=-75/-6

x=12+1/2

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