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x in (-oo:+oo)
(3/8)/10 = x/20 // - x/20
(3/8)/10-(x/20) = 0
3/80-1/20*x = 0 // - 3/80
-1/20*x = -3/80 // : -1/20
x = -3/80/(-1/20)
x = 3/4
x = 3/4
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