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8x+9=2x-80
We move all terms to the left:
8x+9-(2x-80)=0
We get rid of parentheses
8x-2x+80+9=0
We add all the numbers together, and all the variables
6x+89=0
We move all terms containing x to the left, all other terms to the right
6x=-89
x=-89/6
x=-14+5/6
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