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84+10x=-12x+15
We move all terms to the left:
84+10x-(-12x+15)=0
We get rid of parentheses
10x+12x-15+84=0
We add all the numbers together, and all the variables
22x+69=0
We move all terms containing x to the left, all other terms to the right
22x=-69
x=-69/22
x=-3+3/22
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