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40.5=5x+18
We move all terms to the left:
40.5-(5x+18)=0
We get rid of parentheses
-5x-18+40.5=0
We add all the numbers together, and all the variables
-5x+22.5=0
We move all terms containing x to the left, all other terms to the right
-5x=-22.5
x=-22.5/-5
x=4+2.5/5
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