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12x-18=9x-3
We move all terms to the left:
12x-18-(9x-3)=0
We get rid of parentheses
12x-9x+3-18=0
We add all the numbers together, and all the variables
3x-15=0
We move all terms containing x to the left, all other terms to the right
3x=15
x=15/3
x=5
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