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90=3x-12
We move all terms to the left:
90-(3x-12)=0
We get rid of parentheses
-3x+12+90=0
We add all the numbers together, and all the variables
-3x+102=0
We move all terms containing x to the left, all other terms to the right
-3x=-102
x=-102/-3
x=+34
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