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x-((3/7)*(x-((5/12)*x)))-((5/12)*x) = 8700 // - 8700
x-((3/7)*(x-((5/12)*x)))-((5/12)*x)-8700 = 0
(-3/7)*(x+(-5/12)*x)+x+(-5/12)*x-8700 = 0
x-3/7*7/12*x+(-5*x)/12-8700 = 0
(-3/7*7/12*12*x)/12+(12*x)/12+(-5*x)/12+(-8700*12)/12 = 0
12*x-3/7*7/12*12*x-5*x-8700*12 = 0
9*x-5*x-104400 = 0
4*x-104400 = 0
(4*x-104400)/12 = 0
(4*x-104400)/12 = 0 // * 12
4*x-104400 = 0
4*x-104400 = 0 // + 104400
4*x = 104400 // : 4
x = 104400/4
x = 26100
x = 26100
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