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t in (-oo:+oo)
(1/2)*t+2/9 = 5 // - 5
(1/2)*t+2/9-5 = 0
1/2*t-43/9 = 0 // + 43/9
1/2*t = 43/9 // : 1/2
t = 43/9/1/2
t = 86/9
t = 86/9
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