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t in (-oo:+oo)
(2/3)*t-6 = -86/15 // + -86/15
(2/3)*t-(-86/15)-6 = 0
(2/3)*t+86/15-6 = 0
2/3*t-4/15 = 0 // + 4/15
2/3*t = 4/15 // : 2/3
t = 4/15/2/3
t = 2/5
t = 2/5
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