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t in (-oo:+oo)
(2/3)*t+5 = 101/21 // - 101/21
(2/3)*t-(101/21)+5 = 0
(2/3)*t-101/21+5 = 0
2/3*t+4/21 = 0 // - 4/21
2/3*t = -4/21 // : 2/3
t = -4/21/2/3
t = -2/7
t = -2/7
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