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x in (-oo:+oo)
(3/8)/20 = x/10 // - x/10
(3/8)/20-(x/10) = 0
3/160-1/10*x = 0 // - 3/160
-1/10*x = -3/160 // : -1/10
x = -3/160/(-1/10)
x = 3/16
x = 3/16
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