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t in (-oo:+oo)
7/9-4*t-(3*t) = -119/9 // + -119/9
7/9-4*t-(3*t)-(-119/9) = 0
7/9-4*t-3*t+119/9 = 0
14-7*t = 0 // - 14
-7*t = -14 // : -7
t = -14/(-7)
t = 2
t = 2
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