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t in (-oo:+oo)
1/7-3*t = 3*t+1 // - 3*t+1
1/7-3*t-(3*t)-1 = 0
1/7-3*t-3*t-1 = 0
-6*t-6/7 = 0 // + 6/7
-6*t = 6/7 // : -6
t = 6/7/(-6)
t = -1/7
t = -1/7
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