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t in (-oo:+oo)
7*t+1 = 12/5 // - 12/5
7*t-(12/5)+1 = 0
7*t-12/5+1 = 0
7*t-7/5 = 0 // + 7/5
7*t = 7/5 // : 7
t = 7/5/7
t = 1/5
t = 1/5
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