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0.85x=x-39
We move all terms to the left:
0.85x-(x-39)=0
We get rid of parentheses
0.85x-x+39=0
We add all the numbers together, and all the variables
-0.15x+39=0
We move all terms containing x to the left, all other terms to the right
-0.15x=-39
x=-39/-0.15
x=+260
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