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t in (-oo:+oo)
2*t-((1/2)*(9-(4*t)))+5/2-8 = 0
(-1/2)*(9-4*t)+2*t+5/2-8 = 0
2*t-1/2*(9-4*t)+5/2-8 = 0
(-1/2*2*(9-4*t))/2+(2*2*t)/2+5/2+(-8*2)/2 = 0
2*2*t-1/2*2*(9-4*t)-8*2+5 = 0
8*t-16-9+5 = 0
8*t-16-4 = 0
8*t-20 = 0
(8*t-20)/2 = 0
(8*t-20)/2 = 0 // * 2
8*t-20 = 0
8*t-20 = 0 // + 20
8*t = 20 // : 8
t = 20/8
t = 5/2
t = 5/2
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