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t in (-oo:+oo)
(4/7)*t-8 = -632/77 // + -632/77
(4/7)*t-(-632/77)-8 = 0
(4/7)*t+632/77-8 = 0
4/7*t+16/77 = 0 // - 16/77
4/7*t = -16/77 // : 4/7
t = -16/77/4/7
t = -4/11
t = -4/11
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