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t in (-oo:+oo)
31 = 4*t+t+6 // - 4*t+t+6
31-(4*t)-t-6 = 0
31-4*t-t-6 = 0
25-5*t = 0 // - 25
-5*t = -25 // : -5
t = -25/(-5)
t = 5
t = 5
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