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t in (-oo:+oo)
86 = 3*t+4*t+2 // - 3*t+4*t+2
86-(3*t)-(4*t)-2 = 0
86-3*t-4*t-2 = 0
84-7*t = 0 // - 84
-7*t = -84 // : -7
t = -84/(-7)
t = 12
t = 12
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