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t in (-oo:+oo)
15/9 = (-1/3)*t-(7/2) // - (-1/3)*t-(7/2)
15/9-((-1/3)*t)+7/2 = 0
(1/3)*t+15/9+7/2 = 0
1/3*t+31/6 = 0 // - 31/6
1/3*t = -31/6 // : 1/3
t = -31/6/1/3
t = -31/2
t = -31/2
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