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t in (-oo:+oo)
(5*t+6)/7 = (8*t-9)/5 // - (8*t-9)/5
(5*t+6)/7-((8*t-9)/5) = 0
(5*t+6)/7+(-1*(8*t-9))/5 = 0
(5*(5*t+6))/(5*7)+(-1*7*(8*t-9))/(5*7) = 0
5*(5*t+6)-1*7*(8*t-9) = 0
93-31*t = 0
(93-31*t)/(5*7) = 0
(93-31*t)/(5*7) = 0 // * 5*7
93-31*t = 0
93-31*t = 0 // - 93
-31*t = -93 // : -31
t = -93/(-31)
t = 3
t = 3
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