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t in (-oo:+oo)
(-5/6)*t = 7/9 // - 7/9
(-5/6)*t-(7/9) = 0
(-5/6)*t-7/9 = 0
-5/6*t-7/9 = 0 // + 7/9
-5/6*t = 7/9 // : -5/6
t = 7/9/(-5/6)
t = -14/15
t = -14/15
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