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2.5-((1/3)*(80-x)) = 60 // - 60
2.5-((1/3)*(80-x))-60 = 0
(-1/3)*(80-x)-60+2.5 = 0
2.5-1/3*(80-x)-60 = 0
2.5-1/3*(80-x)-60 = 0
1/3*x-260/3+2.5 = 0
1/3*x-84.16666667 = 0
1/3*x-84.16666667 = 0
1/3*x-84.16666667 = 0 // + 84.16666667
1/3*x = 84.16666667 // : 1/3
x = 84.16666667/1/3
x = 252.50000254
x = 252.50000254
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