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t in (-oo:+oo)
3-t = (5/7)*t-(51/7) // - (5/7)*t-(51/7)
51/7-t-((5/7)*t)+3 = 0
(-5/7)*t-t+51/7+3 = 0
72/7-12/7*t = 0 // - 72/7
-12/7*t = -72/7 // : -12/7
t = -72/7/(-12/7)
t = 6
t = 6
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