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x in (-oo:+oo)
(15/100)*x = 50 // - 50
(15/100)*x-50 = 0
3/20*x-50 = 0 // + 50
3/20*x = 50 // : 3/20
x = 50/3/20
x = 1000/3
x = 1000/3
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