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90=36+3x
We move all terms to the left:
90-(36+3x)=0
We add all the numbers together, and all the variables
-(3x+36)+90=0
We get rid of parentheses
-3x-36+90=0
We add all the numbers together, and all the variables
-3x+54=0
We move all terms containing x to the left, all other terms to the right
-3x=-54
x=-54/-3
x=+18
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