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t in (-oo:+oo)
7*t+7*t-(5/7) = 230/21 // - 230/21
7*t+7*t-(5/7)-(230/21) = 0
7*t+7*t-5/7-230/21 = 0
14*t-35/3 = 0 // + 35/3
14*t = 35/3 // : 14
t = 35/3/14
t = 5/6
t = 5/6
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