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t in (-oo:+oo)
-((2/5)*t)-4/7 = -104/35 // + -104/35
-((2/5)*t)-4/7-(-104/35) = 0
(-2/5)*t-4/7+104/35 = 0
12/5-2/5*t = 0 // - 12/5
-2/5*t = -12/5 // : -2/5
t = -12/5/(-2/5)
t = 6
t = 6
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