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t in (-oo:+oo)
-7/11 = 6*t-2*t-1 // - 6*t-2*t-1
1-(-2*t)-(6*t)-7/11 = 0
2*t-6*t-7/11+1 = 0
4/11-4*t = 0 // - 4/11
-4*t = -4/11 // : -4
t = -4/11/(-4)
t = 1/11
t = 1/11
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