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12x-7x=15-3+36
We move all terms to the left:
12x-7x-(15-3+36)=0
We add all the numbers together, and all the variables
12x-7x-48=0
We add all the numbers together, and all the variables
5x-48=0
We move all terms containing x to the left, all other terms to the right
5x=48
x=48/5
x=9+3/5
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