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t in (-oo:+oo)
1-t = 7*t-15 // - 7*t-15
1-t-(7*t)+15 = 0
1-t-7*t+15 = 0
16-8*t = 0 // - 16
-8*t = -16 // : -8
t = -16/(-8)
t = 2
t = 2
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