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63=7.5x+18
We move all terms to the left:
63-(7.5x+18)=0
We get rid of parentheses
-7.5x-18+63=0
We add all the numbers together, and all the variables
-7.5x+45=0
We move all terms containing x to the left, all other terms to the right
-7.5x=-45
x=-45/-7.5
x=+6
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