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t in (-oo:+oo)
(4/7)*(t-7) = (1/9)*t-(2/3) // - (1/9)*t-(2/3)
(4/7)*(t-7)-((1/9)*t)+2/3 = 0
(4/7)*(t-7)+(-1/9)*t+2/3 = 0
4/7*(t-7)-t/9+2/3 = 0
(4/7*3*9*(t-7))/(3*9)+(3*(-t))/(3*9)+(2*9)/(3*9) = 0
4/7*3*9*(t-7)+3*(-t)+2*9 = 0
87/7*t-108+18 = 0
87/7*t-90 = 0
(87/7*t-90)/(3*9) = 0
(87/7*t-90)/(3*9) = 0 // * 3*9
87/7*t-90 = 0
87/7*t-90 = 0 // + 90
87/7*t = 90 // : 87/7
t = 90/87/7
t = 210/29
t = 210/29
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