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x=0.15(100-x)
We move all terms to the left:
x-(0.15(100-x))=0
We add all the numbers together, and all the variables
x-(0.15(-1x+100))=0
We calculate terms in parentheses: -(0.15(-1x+100)), so:We get rid of parentheses
0.15(-1x+100)
We multiply parentheses
-0.15x+15
Back to the equation:
-(-0.15x+15)
x+0.15x-15=0
We add all the numbers together, and all the variables
1.15x-15=0
We move all terms containing x to the left, all other terms to the right
1.15x=15
x=15/1.15
x=13+0.050000000000001/1.15
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