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63=18x-72
We move all terms to the left:
63-(18x-72)=0
We get rid of parentheses
-18x+72+63=0
We add all the numbers together, and all the variables
-18x+135=0
We move all terms containing x to the left, all other terms to the right
-18x=-135
x=-135/-18
x=7+1/2
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