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t in (-oo:+oo)
(1/7)*t+3 = 23/7 // - 23/7
(1/7)*t-(23/7)+3 = 0
(1/7)*t-23/7+3 = 0
1/7*t-2/7 = 0 // + 2/7
1/7*t = 2/7 // : 1/7
t = 2/7/1/7
t = 2
t = 2
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