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4x-18=9x+3
We move all terms to the left:
4x-18-(9x+3)=0
We get rid of parentheses
4x-9x-3-18=0
We add all the numbers together, and all the variables
-5x-21=0
We move all terms containing x to the left, all other terms to the right
-5x=21
x=21/-5
x=-4+1/5
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