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n in (-oo:+oo)
(3/4)*n = 3*n-63 // - 3*n-63
(3/4)*n-(3*n)+63 = 0
(3/4)*n-3*n+63 = 0
63-9/4*n = 0 // - 63
-9/4*n = -63 // : -9/4
n = -63/(-9/4)
n = 28
n = 28
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