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t in (-oo:+oo)
11*(4/7)*t = -3 // + 3
11*(4/7)*t+3 = 0
44/7*t+3 = 0 // - 3
44/7*t = -3 // : 44/7
t = -3/44/7
t = -21/44
t = -21/44
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