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x in (-oo:+oo)
0.04*(x/3)+0.03*(x/2)+0.035*(x/6) = 615 // - 615
0.04*(x/3)+0.03*(x/2)+0.035*(x/6)-615 = 0
0.03416666665*x-615 = 0 // + 615
0.03416666665*x = 615 // : 0.03416666665
x = 615/0.03416666665
x = 18000.00000878
x = 18000.00000878
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