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t in (-oo:+oo)
6*t+(5/6)*t+4 = 142/15 // - 142/15
6*t+(5/6)*t-(142/15)+4 = 0
6*t+(5/6)*t-142/15+4 = 0
41/6*t-82/15 = 0 // + 82/15
41/6*t = 82/15 // : 41/6
t = 82/15/41/6
t = 4/5
t = 4/5
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