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t in (-oo:+oo)
79/42 = 2*t+(1/6)*t-(2/7) // - 2*t+(1/6)*t-(2/7)
79/42-(2*t)-((1/6)*t)+2/7 = 0
(-1/6)*t-2*t+79/42+2/7 = 0
13/6-13/6*t = 0 // - 13/6
-13/6*t = -13/6 // : -13/6
t = -13/6/(-13/6)
t = 1
t = 1
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