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8x+18=12x-30
We move all terms to the left:
8x+18-(12x-30)=0
We get rid of parentheses
8x-12x+30+18=0
We add all the numbers together, and all the variables
-4x+48=0
We move all terms containing x to the left, all other terms to the right
-4x=-48
x=-48/-4
x=+12
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