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t in (-oo:+oo)
(1/8)*t+9/7 = 2 // - 2
(1/8)*t+9/7-2 = 0
1/8*t-5/7 = 0 // + 5/7
1/8*t = 5/7 // : 1/8
t = 5/7/1/8
t = 40/7
t = 40/7
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