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12x-3x=8+x
We move all terms to the left:
12x-3x-(8+x)=0
We add all the numbers together, and all the variables
12x-3x-(x+8)=0
We add all the numbers together, and all the variables
9x-(x+8)=0
We get rid of parentheses
9x-x-8=0
We add all the numbers together, and all the variables
8x-8=0
We move all terms containing x to the left, all other terms to the right
8x=8
x=8/8
x=1
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