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t in (-oo:+oo)
(2/7)*t+4 = 173/42 // - 173/42
(2/7)*t-(173/42)+4 = 0
(2/7)*t-173/42+4 = 0
2/7*t-5/42 = 0 // + 5/42
2/7*t = 5/42 // : 2/7
t = 5/42/2/7
t = 5/12
t = 5/12
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