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t in (-oo:+oo)
28 = 7-((3/2)*t) // - 7-((3/2)*t)
(3/2)*t-7+28 = 0
3/2*t+21 = 0 // - 21
3/2*t = -21 // : 3/2
t = -21/3/2
t = -14
t = -14
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