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12x-8=9x+x
We move all terms to the left:
12x-8-(9x+x)=0
We add all the numbers together, and all the variables
12x-(+10x)-8=0
We get rid of parentheses
12x-10x-8=0
We add all the numbers together, and all the variables
2x-8=0
We move all terms containing x to the left, all other terms to the right
2x=8
x=8/2
x=4
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