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t in (-oo:+oo)
(1/2)*t+(6/7)*t+7/9 = 220/63 // - 220/63
(1/2)*t+(6/7)*t+7/9-(220/63) = 0
(1/2)*t+(6/7)*t+7/9-220/63 = 0
19/14*t-19/7 = 0 // + 19/7
19/14*t = 19/7 // : 19/14
t = 19/7/19/14
t = 2
t = 2
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