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n in (-oo:+oo)
4*(n/3+2) = 28 // - 28
4*(n/3+2)-28 = 0
4*(1/3*n+2)-28 = 0
4*(1/3*n+2)-28 = 0
4/3*n-20 = 0
4/3*n-20 = 0
4/3*n-20 = 0 // + 20
4/3*n = 20 // : 4/3
n = 20/4/3
n = 15
n = 15
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