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t in (-oo:+oo)
(8/7)*t = -9/5 // + -9/5
(8/7)*t-(-9/5) = 0
(8/7)*t+9/5 = 0
8/7*t+9/5 = 0 // - 9/5
8/7*t = -9/5 // : 8/7
t = -9/5/8/7
t = -63/40
t = -63/40
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