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t in (-oo:+oo)
(2/7)*(t+2/3) = (1/5)*(t-(2/3)) // - (1/5)*(t-(2/3))
(2/7)*(t+2/3)-((1/5)*(t-(2/3))) = 0
(2/7)*(t+2/3)+(-1/5)*(t-2/3) = 0
2/7*(t+2/3)-1/5*(t-2/3) = 0
2/7*(t+2/3)-1/5*(t-2/3) = 0
3/35*t+34/105 = 0
3/35*t+34/105 = 0
3/35*t+34/105 = 0 // - 34/105
3/35*t = -34/105 // : 3/35
t = -34/105/3/35
t = -34/9
t = -34/9
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