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t in (-oo:+oo)
(-4/7)*t+8/9 = 191/63-t // - 191/63-t
(-4/7)*t+t+8/9-(191/63) = 0
(-4/7)*t+t+8/9-191/63 = 0
3/7*t-15/7 = 0 // + 15/7
3/7*t = 15/7 // : 3/7
t = 15/7/3/7
t = 5
t = 5
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