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n in (-oo:+oo)
7*n+5 = -4*n-28 // + -4*n-28
7*n-(-4*n)+5+28 = 0
7*n+4*n+5+28 = 0
11*n+33 = 0 // - 33
11*n = -33 // : 11
n = -33/11
n = -3
n = -3
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