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t in (-oo:+oo)
(1/5)*t+3/7 = 2 // - 2
(1/5)*t+3/7-2 = 0
1/5*t-11/7 = 0 // + 11/7
1/5*t = 11/7 // : 1/5
t = 11/7/1/5
t = 55/7
t = 55/7
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