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9x-18=10x+3
We move all terms to the left:
9x-18-(10x+3)=0
We get rid of parentheses
9x-10x-3-18=0
We add all the numbers together, and all the variables
-1x-21=0
We move all terms containing x to the left, all other terms to the right
-x=21
x=21/-1
x=-21
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