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t in (-oo:+oo)
(5/7)*t+5/7 = 30/49 // - 30/49
(5/7)*t+5/7-(30/49) = 0
(5/7)*t+5/7-30/49 = 0
5/7*t+5/49 = 0 // - 5/49
5/7*t = -5/49 // : 5/7
t = -5/49/5/7
t = -1/7
t = -1/7
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