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n in (-oo:+oo)
5*(4*n-8) = -200 // + 200
5*(4*n-8)+200 = 0
5*(4*n-8)+200 = 0
20*n+160 = 0
20*n+160 = 0
20*n+160 = 0 // - 160
20*n = -160 // : 20
n = -160/20
n = -8
n = -8
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