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n in (-oo:+oo)
(2/4)*(n+3) = 9 // - 9
(2/4)*(n+3)-9 = 0
1/2*(n+3)-9 = 0
1/2*(n+3)-9 = 0
1/2*n-15/2 = 0
1/2*n-15/2 = 0
1/2*n-15/2 = 0 // + 15/2
1/2*n = 15/2 // : 1/2
n = 15/2/1/2
n = 15
n = 15
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