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10x-9=8x+18
We move all terms to the left:
10x-9-(8x+18)=0
We get rid of parentheses
10x-8x-18-9=0
We add all the numbers together, and all the variables
2x-27=0
We move all terms containing x to the left, all other terms to the right
2x=27
x=27/2
x=13+1/2
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