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8x-9=6x-51
We move all terms to the left:
8x-9-(6x-51)=0
We get rid of parentheses
8x-6x+51-9=0
We add all the numbers together, and all the variables
2x+42=0
We move all terms containing x to the left, all other terms to the right
2x=-42
x=-42/2
x=-21
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