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t in (-oo:+oo)
t/28 = 4/7 // - 4/7
t/28-(4/7) = 0
t/28-4/7 = 0
1/28*t-4/7 = 0 // + 4/7
1/28*t = 4/7 // : 1/28
t = 4/7/1/28
t = 16
t = 16
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