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t in (-oo:+oo)
(2/7)*t+4 = 179/42 // - 179/42
(2/7)*t-(179/42)+4 = 0
(2/7)*t-179/42+4 = 0
2/7*t-11/42 = 0 // + 11/42
2/7*t = 11/42 // : 2/7
t = 11/42/2/7
t = 11/12
t = 11/12
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