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0.10(x-80)+0.10x=9
We move all terms to the left:
0.10(x-80)+0.10x-(9)=0
We add all the numbers together, and all the variables
0.10x+0.10(x-80)-9=0
We multiply parentheses
0.10x+0.1x-8-9=0
We add all the numbers together, and all the variables
0.2x-17=0
We move all terms containing x to the left, all other terms to the right
0.2x=17
x=17/0.2
x=85
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