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5=x+15-7
We move all terms to the left:
5-(x+15-7)=0
We add all the numbers together, and all the variables
-(x+8)+5=0
We get rid of parentheses
-x-8+5=0
We add all the numbers together, and all the variables
-1x-3=0
We move all terms containing x to the left, all other terms to the right
-x=3
x=3/-1
x=-3
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