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