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n in (-oo:+oo)
55/0.4 = (0.4*n)/0.4 // - (0.4*n)/0.4
55/0.4-((0.4*n)/0.4) = 0
55/0.4-n = 0
137.5-n = 0 // - 137.5
-n = -137.5 // * -1
n = 137.5
n = 137.5
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