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18=-x/5-12
We move all terms to the left:
18-(-x/5-12)=0
We get rid of parentheses
x/5+12+18=0
We multiply all the terms by the denominator
x+12*5+18*5=0
We add all the numbers together, and all the variables
x+150=0
We move all terms containing x to the left, all other terms to the right
x=-150
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