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t in (-oo:+oo)
28 = 7-((2/3)*t) // - 7-((2/3)*t)
(2/3)*t-7+28 = 0
2/3*t+21 = 0 // - 21
2/3*t = -21 // : 2/3
t = -21/2/3
t = -63/2
t = -63/2
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