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n in (-oo:+oo)
(5*n)/2-(2/7) = 66/14 // - 66/14
(5*n)/2-(2/7)-(66/14) = 0
(5*n)/2-2/7-33/7 = 0
5/2*n-5 = 0 // + 5
5/2*n = 5 // : 5/2
n = 5/5/2
n = 2
n = 2
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