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15=x/7+8
We move all terms to the left:
15-(x/7+8)=0
We get rid of parentheses
-x/7-8+15=0
We multiply all the terms by the denominator
-x-8*7+15*7=0
We add all the numbers together, and all the variables
-1x+49=0
We move all terms containing x to the left, all other terms to the right
-x=-49
x=-49/-1
x=+49
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