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9+8x=12x-11
We move all terms to the left:
9+8x-(12x-11)=0
We get rid of parentheses
8x-12x+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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