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t in (-oo:+oo)
(4/15)*t = -2/7 // + -2/7
(4/15)*t-(-2/7) = 0
(4/15)*t+2/7 = 0
4/15*t+2/7 = 0 // - 2/7
4/15*t = -2/7 // : 4/15
t = -2/7/4/15
t = -15/14
t = -15/14
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