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t in (-oo:+oo)
(3/5)*t-((1/10)*t) = t-(7/2) // - t-(7/2)
(3/5)*t-((1/10)*t)-t+7/2 = 0
(3/5)*t+(-1/10)*t-t+7/2 = 0
7/2-1/2*t = 0 // - 7/2
-1/2*t = -7/2 // : -1/2
t = -7/2/(-1/2)
t = 7
t = 7
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