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18-3x=6x-90
We move all terms to the left:
18-3x-(6x-90)=0
We get rid of parentheses
-3x-6x+90+18=0
We add all the numbers together, and all the variables
-9x+108=0
We move all terms containing x to the left, all other terms to the right
-9x=-108
x=-108/-9
x=+12
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