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9x-30=18x-3
We move all terms to the left:
9x-30-(18x-3)=0
We get rid of parentheses
9x-18x+3-30=0
We add all the numbers together, and all the variables
-9x-27=0
We move all terms containing x to the left, all other terms to the right
-9x=27
x=27/-9
x=-3
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