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12-9x=8x-4
We move all terms to the left:
12-9x-(8x-4)=0
We get rid of parentheses
-9x-8x+4+12=0
We add all the numbers together, and all the variables
-17x+16=0
We move all terms containing x to the left, all other terms to the right
-17x=-16
x=-16/-17
x=16/17
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