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t in (-oo:+oo)
t/6 = -4/7 // + -4/7
t/6-(-4/7) = 0
t/6+4/7 = 0
1/6*t+4/7 = 0 // - 4/7
1/6*t = -4/7 // : 1/6
t = -4/7/1/6
t = -24/7
t = -24/7
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