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t in (-oo:+oo)
5/6-3*t = -49/6 // + -49/6
5/6-3*t-(-49/6) = 0
5/6-3*t+49/6 = 0
9-3*t = 0 // - 9
-3*t = -9 // : -3
t = -9/(-3)
t = 3
t = 3
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