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8x-12=9x+18
We move all terms to the left:
8x-12-(9x+18)=0
We get rid of parentheses
8x-9x-18-12=0
We add all the numbers together, and all the variables
-1x-30=0
We move all terms containing x to the left, all other terms to the right
-x=30
x=30/-1
x=-30
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