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t in (-oo:+oo)
(7/2)*t = -9/5 // + -9/5
(7/2)*t-(-9/5) = 0
(7/2)*t+9/5 = 0
7/2*t+9/5 = 0 // - 9/5
7/2*t = -9/5 // : 7/2
t = -9/5/7/2
t = -18/35
t = -18/35
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