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t in (-oo:+oo)
(8/9)*t+6 = 8 // - 8
(8/9)*t-8+6 = 0
8/9*t-2 = 0 // + 2
8/9*t = 2 // : 8/9
t = 2/8/9
t = 9/4
t = 9/4
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