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x+(x+3)+(x+5)=81
We move all terms to the left:
x+(x+3)+(x+5)-(81)=0
We get rid of parentheses
x+x+x+3+5-81=0
We add all the numbers together, and all the variables
3x-73=0
We move all terms containing x to the left, all other terms to the right
3x=73
x=73/3
x=24+1/3
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