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n in (-oo:+oo)
4*(n+3) = -28 // + 28
4*(n+3)+28 = 0
4*(n+3)+28 = 0
4*n+40 = 0
4*n+40 = 0
4*n+40 = 0 // - 40
4*n = -40 // : 4
n = -40/4
n = -10
n = -10
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