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n in (-oo:+oo)
(1/8)*n = -4.2 // + 4.2
(1/8)*n+4.2 = 0
1/8*n+4.2 = 0 // - 4.2
1/8*n = -4.2 // : 1/8
n = -4.2/1/8
n = -33.6
n = -33.6
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