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3x+90=6x+18
We move all terms to the left:
3x+90-(6x+18)=0
We get rid of parentheses
3x-6x-18+90=0
We add all the numbers together, and all the variables
-3x+72=0
We move all terms containing x to the left, all other terms to the right
-3x=-72
x=-72/-3
x=+24
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