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t in (-oo:+oo)
6 = (1/5)*t // - (1/5)*t
6-((1/5)*t) = 0
(-1/5)*t+6 = 0
6-1/5*t = 0 // - 6
-1/5*t = -6 // : -1/5
t = -6/(-1/5)
t = 30
t = 30
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