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x in (-oo:+oo)
(3*x)/5 = 12.5 // - 12.5
(3*x)/5-12.5 = 0
3/5*x-12.5 = 0 // + 12.5
3/5*x = 12.5 // : 3/5
x = 12.5/3/5
x = 20.83333333
x = 20.83333333
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