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X in (-oo:+oo)
(2/5)/45 = X/70 // - X/70
(2/5)/45-(X/70) = 0
2/225-1/70*X = 0 // - 2/225
-1/70*X = -2/225 // : -1/70
X = -2/225/(-1/70)
X = 28/45
X = 28/45
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