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10(x+1)+3x=80
We move all terms to the left:
10(x+1)+3x-(80)=0
We add all the numbers together, and all the variables
3x+10(x+1)-80=0
We multiply parentheses
3x+10x+10-80=0
We add all the numbers together, and all the variables
13x-70=0
We move all terms containing x to the left, all other terms to the right
13x=70
x=70/13
x=5+5/13
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