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t in (-oo:+oo)
(10*t)/21-(t/3) = 1 // - 1
(10*t)/21-(t/3)-1 = 0
1/7*t-1 = 0 // + 1
1/7*t = 1 // : 1/7
t = 1/1/7
t = 7
t = 7
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