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18-x/2=-15
We move all terms to the left:
18-x/2-(-15)=0
We add all the numbers together, and all the variables
-x/2+33=0
We multiply all the terms by the denominator
-x+33*2=0
We add all the numbers together, and all the variables
-1x+66=0
We move all terms containing x to the left, all other terms to the right
-x=-66
x=-66/-1
x=+66
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