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-15=x/2+3
We move all terms to the left:
-15-(x/2+3)=0
We get rid of parentheses
-x/2-3-15=0
We multiply all the terms by the denominator
-x-3*2-15*2=0
We add all the numbers together, and all the variables
-1x-36=0
We move all terms containing x to the left, all other terms to the right
-x=36
x=36/-1
x=-36
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