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t in (-oo:+oo)
(3/7)*t+5/7 = (-2/7)*t-(50/7) // - (-2/7)*t-(50/7)
(3/7)*t-((-2/7)*t)+5/7+50/7 = 0
(3/7)*t+(2/7)*t+5/7+50/7 = 0
5/7*t+55/7 = 0 // - 55/7
5/7*t = -55/7 // : 5/7
t = -55/7/5/7
t = -11
t = -11
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