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X in (-oo:+oo)
3/4-(1/5) = X/20 // - X/20
3/4-(X/20)-(1/5) = 0
3/4-(X/20)-1/5 = 0
11/20-1/20*X = 0 // - 11/20
-1/20*X = -11/20 // : -1/20
X = -11/20/(-1/20)
X = 11
X = 11
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