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x-x(0.15)=285
We move all terms to the left:
x-x(0.15)-(285)=0
We multiply parentheses
x-0.15x-285=0
We add all the numbers together, and all the variables
0.85x-285=0
We move all terms containing x to the left, all other terms to the right
0.85x=285
x=285/0.85
x=335+0.25/0.85
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