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t in (-oo:+oo)
(5/7)*t-9 = -123/14 // + -123/14
(5/7)*t-(-123/14)-9 = 0
(5/7)*t+123/14-9 = 0
5/7*t-3/14 = 0 // + 3/14
5/7*t = 3/14 // : 5/7
t = 3/14/5/7
t = 3/10
t = 3/10
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