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8x-9=18x+51
We move all terms to the left:
8x-9-(18x+51)=0
We get rid of parentheses
8x-18x-51-9=0
We add all the numbers together, and all the variables
-10x-60=0
We move all terms containing x to the left, all other terms to the right
-10x=60
x=60/-10
x=-6
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