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t in (-oo:+oo)
(1/6)*t+15/7 = 4 // - 4
(1/6)*t+15/7-4 = 0
1/6*t-13/7 = 0 // + 13/7
1/6*t = 13/7 // : 1/6
t = 13/7/1/6
t = 78/7
t = 78/7
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