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(9x-18)=4x+12
We move all terms to the left:
(9x-18)-(4x+12)=0
We get rid of parentheses
9x-4x-18-12=0
We add all the numbers together, and all the variables
5x-30=0
We move all terms containing x to the left, all other terms to the right
5x=30
x=30/5
x=6
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