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t in (-oo:+oo)
t/2-5.5 = 4.5 // - 4.5
t/2-5.5-4.5 = 0
1/2*t-10 = 0 // + 10
1/2*t = 10 // : 1/2
t = 10/1/2
t = 20
t = 20
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