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t in (-oo:+oo)
(7/2)*t+2 = 7*t+4 // - 7*t+4
(7/2)*t-(7*t)-4+2 = 0
(7/2)*t-7*t-4+2 = 0
-7/2*t-2 = 0 // + 2
-7/2*t = 2 // : -7/2
t = 2/(-7/2)
t = -4/7
t = -4/7
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