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x in (-oo:+oo)
(3/2)/50 = x/20 // - x/20
(3/2)/50-(x/20) = 0
3/100-1/20*x = 0 // - 3/100
-1/20*x = -3/100 // : -1/20
x = -3/100/(-1/20)
x = 3/5
x = 3/5
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