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t in (-oo:+oo)
(6/7)*t+4*t+7 = 181/21 // - 181/21
(6/7)*t+4*t-(181/21)+7 = 0
(6/7)*t+4*t-181/21+7 = 0
34/7*t-34/21 = 0 // + 34/21
34/7*t = 34/21 // : 34/7
t = 34/21/34/7
t = 1/3
t = 1/3
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