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t in (-oo:+oo)
4*t+2/5 = 22/5 // - 22/5
4*t+2/5-(22/5) = 0
4*t+2/5-22/5 = 0
4*t-4 = 0 // + 4
4*t = 4 // : 4
t = 4/4
t = 1
t = 1
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