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x+(x+8)=15
We move all terms to the left:
x+(x+8)-(15)=0
We get rid of parentheses
x+x+8-15=0
We add all the numbers together, and all the variables
2x-7=0
We move all terms containing x to the left, all other terms to the right
2x=7
x=7/2
x=3+1/2
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