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t in (-oo:+oo)
t/8 = -2/9 // + -2/9
t/8-(-2/9) = 0
t/8+2/9 = 0
1/8*t+2/9 = 0 // - 2/9
1/8*t = -2/9 // : 1/8
t = -2/9/1/8
t = -16/9
t = -16/9
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