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18=3x+15
We move all terms to the left:
18-(3x+15)=0
We get rid of parentheses
-3x-15+18=0
We add all the numbers together, and all the variables
-3x+3=0
We move all terms containing x to the left, all other terms to the right
-3x=-3
x=-3/-3
x=1
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