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15x=12x+15=180
We move all terms to the left:
15x-(12x+15)=0
We get rid of parentheses
15x-12x-15=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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