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n in (-oo:+oo)
(n+8.9)/8.4 = -8.1 // + 8.1
(n+8.9)/8.4+8.1 = 0
(n+8.9)/8.4+(8.1*8.4)/8.4 = 0
n+8.1*8.4+8.9 = 0
n+76.94 = 0
(n+76.94)/8.4 = 0
(n+76.94)/8.4 = 0 // * 8.4
n+76.94 = 0
n+76.94 = 0 // - 76.94
n = -76.94
n = -76.94
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