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7x-12=3x-18
We move all terms to the left:
7x-12-(3x-18)=0
We get rid of parentheses
7x-3x+18-12=0
We add all the numbers together, and all the variables
4x+6=0
We move all terms containing x to the left, all other terms to the right
4x=-6
x=-6/4
x=-1+1/2
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