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t in (-oo:+oo)
-8 = (4/9)*t // - (4/9)*t
-((4/9)*t)-8 = 0
(-4/9)*t-8 = 0
-4/9*t-8 = 0 // + 8
-4/9*t = 8 // : -4/9
t = 8/(-4/9)
t = -18
t = -18
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