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90=15+3x+3x
We move all terms to the left:
90-(15+3x+3x)=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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