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t in (-oo:+oo)
(-1/7)*t+1/5 = 17/35 // - 17/35
(-1/7)*t+1/5-(17/35) = 0
(-1/7)*t+1/5-17/35 = 0
-1/7*t-2/7 = 0 // + 2/7
-1/7*t = 2/7 // : -1/7
t = 2/7/(-1/7)
t = -2
t = -2
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