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12x-9=8x+11
We move all terms to the left:
12x-9-(8x+11)=0
We get rid of parentheses
12x-8x-11-9=0
We add all the numbers together, and all the variables
4x-20=0
We move all terms containing x to the left, all other terms to the right
4x=20
x=20/4
x=5
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