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t in (-oo:+oo)
-6*t = -36/7 // + -36/7
-6*t-(-36/7) = 0
36/7-6*t = 0
36/7-6*t = 0 // - 36/7
-6*t = -36/7 // : -6
t = -36/7/(-6)
t = 6/7
t = 6/7
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