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t in (-oo:+oo)
1/45 = (2/5)*t // - (2/5)*t
1/45-((2/5)*t) = 0
(-2/5)*t+1/45 = 0
1/45-2/5*t = 0 // - 1/45
-2/5*t = -1/45 // : -2/5
t = -1/45/(-2/5)
t = 1/18
t = 1/18
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