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t in (-oo:+oo)
(-5/7)*t-(5/6) = -25/21 // + -25/21
(-5/7)*t-(5/6)-(-25/21) = 0
(-5/7)*t-5/6+25/21 = 0
5/14-5/7*t = 0 // - 5/14
-5/7*t = -5/14 // : -5/7
t = -5/14/(-5/7)
t = 1/2
t = 1/2
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