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t in (-oo:+oo)
(7/9)*t = 28/36 // - 28/36
(7/9)*t-(28/36) = 0
(7/9)*t-7/9 = 0
7/9*t-7/9 = 0 // + 7/9
7/9*t = 7/9 // : 7/9
t = 7/9/7/9
t = 1
t = 1
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