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(x+5)+x+x=80
We move all terms to the left:
(x+5)+x+x-(80)=0
We add all the numbers together, and all the variables
2x+(x+5)-80=0
We get rid of parentheses
2x+x+5-80=0
We add all the numbers together, and all the variables
3x-75=0
We move all terms containing x to the left, all other terms to the right
3x=75
x=75/3
x=25
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