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t in (-oo:+oo)
(2/7)*t+4*t-2/9 = -230/63 // + -230/63
(2/7)*t+4*t-2/9-(-230/63) = 0
(2/7)*t+4*t-2/9+230/63 = 0
30/7*t+24/7 = 0 // - 24/7
30/7*t = -24/7 // : 30/7
t = -24/7/30/7
t = -4/5
t = -4/5
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