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t in (-oo:+oo)
(2/3)*t = 42/3 // - 42/3
(2/3)*t-(42/3) = 0
(2/3)*t-14 = 0
2/3*t-14 = 0 // + 14
2/3*t = 14 // : 2/3
t = 14/2/3
t = 21
t = 21
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