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n in (-oo:+oo)
(3/12)*n = 15/6 // - 15/6
(3/12)*n-(15/6) = 0
(3/12)*n-5/2 = 0
1/4*n-5/2 = 0 // + 5/2
1/4*n = 5/2 // : 1/4
n = 5/2/1/4
n = 10
n = 10
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