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15x-12=3x+8
We move all terms to the left:
15x-12-(3x+8)=0
We get rid of parentheses
15x-3x-8-12=0
We add all the numbers together, and all the variables
12x-20=0
We move all terms containing x to the left, all other terms to the right
12x=20
x=20/12
x=1+2/3
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