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t in (-oo:+oo)
(7/2)*t-2 = -(7*t)-4 // + -(7*t)-4
(7/2)*t+7*t-2+4 = 0
21/2*t+2 = 0 // - 2
21/2*t = -2 // : 21/2
t = -2/21/2
t = -4/21
t = -4/21
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