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t in (-oo:+oo)
9-((1/2)*t) = 4*t+5 // - 4*t+5
9-((1/2)*t)-(4*t)-5 = 0
(-1/2)*t-4*t-5+9 = 0
4-9/2*t = 0 // - 4
-9/2*t = -4 // : -9/2
t = -4/(-9/2)
t = 8/9
t = 8/9
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