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x in (-oo:+oo)
x = (3/5)*(24-x) // - (3/5)*(24-x)
x-((3/5)*(24-x)) = 0
(-3/5)*(24-x)+x = 0
x-3/5*(24-x) = 0
x-3/5*(24-x) = 0
8/5*x-72/5 = 0
8/5*x-72/5 = 0
8/5*x-72/5 = 0 // + 72/5
8/5*x = 72/5 // : 8/5
x = 72/5/8/5
x = 9
x = 9
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