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t in (-oo:+oo)
(-5/7)*t+3/5 = 321/35 // - 321/35
(-5/7)*t+3/5-(321/35) = 0
(-5/7)*t+3/5-321/35 = 0
-5/7*t-60/7 = 0 // + 60/7
-5/7*t = 60/7 // : -5/7
t = 60/7/(-5/7)
t = -12
t = -12
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