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t in (-oo:+oo)
(4/7)*t+(5/6)*t+3/8 = 1243/168 // - 1243/168
(4/7)*t+(5/6)*t+3/8-(1243/168) = 0
(4/7)*t+(5/6)*t+3/8-1243/168 = 0
59/42*t-295/42 = 0 // + 295/42
59/42*t = 295/42 // : 59/42
t = 295/42/59/42
t = 5
t = 5
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