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-243=-9x-18
We move all terms to the left:
-243-(-9x-18)=0
We get rid of parentheses
9x+18-243=0
We add all the numbers together, and all the variables
9x-225=0
We move all terms containing x to the left, all other terms to the right
9x=225
x=225/9
x=25
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