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134+15x=12x+8
We move all terms to the left:
134+15x-(12x+8)=0
We get rid of parentheses
15x-12x-8+134=0
We add all the numbers together, and all the variables
3x+126=0
We move all terms containing x to the left, all other terms to the right
3x=-126
x=-126/3
x=-42
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