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0.1(x+80)+1.3x=57
We move all terms to the left:
0.1(x+80)+1.3x-(57)=0
We add all the numbers together, and all the variables
1.3x+0.1(x+80)-57=0
We multiply parentheses
1.3x+0.1x+8-57=0
We add all the numbers together, and all the variables
1.4x-49=0
We move all terms containing x to the left, all other terms to the right
1.4x=49
x=49/1.4
x=35
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