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t in (-oo:+oo)
4*t-1 = t/2 // - t/2
4*t-(t/2)-1 = 0
7/2*t-1 = 0 // + 1
7/2*t = 1 // : 7/2
t = 1/7/2
t = 2/7
t = 2/7
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