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12x+3(x+7)=10x-24
We move all terms to the left:
12x+3(x+7)-(10x-24)=0
We multiply parentheses
12x+3x-(10x-24)+21=0
We get rid of parentheses
12x+3x-10x+24+21=0
We add all the numbers together, and all the variables
5x+45=0
We move all terms containing x to the left, all other terms to the right
5x=-45
x=-45/5
x=-9
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