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x-x(0.15)=8
We move all terms to the left:
x-x(0.15)-(8)=0
We multiply parentheses
x-0.15x-8=0
We add all the numbers together, and all the variables
0.85x-8=0
We move all terms containing x to the left, all other terms to the right
0.85x=8
x=8/0.85
x=9+0.35/0.85
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