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t in (-oo:+oo)
13*((13*t)/42)-(13*(t/6)) = 1 // - 1
13*((13*t)/42)-(13*(t/6))-1 = 0
13*((13*t)/42)+(-13/6)*t-1 = 0
13/7*t-1 = 0 // + 1
13/7*t = 1 // : 13/7
t = 1/13/7
t = 7/13
t = 7/13
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