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t in (-oo:+oo)
1/7-3*t = 31/70 // - 31/70
1/7-3*t-(31/70) = 0
1/7-3*t-31/70 = 0
-3*t-3/10 = 0 // + 3/10
-3*t = 3/10 // : -3
t = 3/10/(-3)
t = -1/10
t = -1/10
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