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12x+3=9x+18
We move all terms to the left:
12x+3-(9x+18)=0
We get rid of parentheses
12x-9x-18+3=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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