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12x+8=15x+12
We move all terms to the left:
12x+8-(15x+12)=0
We get rid of parentheses
12x-15x-12+8=0
We add all the numbers together, and all the variables
-3x-4=0
We move all terms containing x to the left, all other terms to the right
-3x=4
x=4/-3
x=-1+1/3
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