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90=x+10+4x
We move all terms to the left:
90-(x+10+4x)=0
We add all the numbers together, and all the variables
-(5x+10)+90=0
We get rid of parentheses
-5x-10+90=0
We add all the numbers together, and all the variables
-5x+80=0
We move all terms containing x to the left, all other terms to the right
-5x=-80
x=-80/-5
x=+16
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