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n in (-oo:+oo)
-n/2.5 = -75 // + 75
75-n/2.5 = 0
75-0.4*n = 0 // - 75
-0.4*n = -75 // : -0.4
n = -75/(-0.4)
n = 187.5
n = 187.5
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