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x+(x+2)+(x+5)=39
We move all terms to the left:
x+(x+2)+(x+5)-(39)=0
We get rid of parentheses
x+x+x+2+5-39=0
We add all the numbers together, and all the variables
3x-32=0
We move all terms containing x to the left, all other terms to the right
3x=32
x=32/3
x=10+2/3
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