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(10x-2)+(5x-8)+(7x-12)=0
We get rid of parentheses
10x+5x+7x-2-8-12=0
We add all the numbers together, and all the variables
22x-22=0
We move all terms containing x to the left, all other terms to the right
22x=22
x=22/22
x=1
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