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t in (-oo:+oo)
-7*t = -56/11 // + -56/11
-7*t-(-56/11) = 0
56/11-7*t = 0
56/11-7*t = 0 // - 56/11
-7*t = -56/11 // : -7
t = -56/11/(-7)
t = 8/11
t = 8/11
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