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t in (-oo:+oo)
(-6/7)*t+(2/5)*t+6 = 26/7 // - 26/7
(-6/7)*t+(2/5)*t-(26/7)+6 = 0
(-6/7)*t+(2/5)*t-26/7+6 = 0
16/7-16/35*t = 0 // - 16/7
-16/35*t = -16/7 // : -16/35
t = -16/7/(-16/35)
t = 5
t = 5
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