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x in (-oo:+oo)
(0.99*15)/(1.2-0.99) = x // - x
(0.99*15)/(1.2-0.99)-x = 0
70.71428571-x = 0 // - 70.71428571
-x = -70.71428571 // * -1
x = 70.71428571
x = 70.71428571
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