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n in (-oo:+oo)
n/4 = 0.3/1.5 // - 0.3/1.5
n/4-(0.3/1.5) = 0
n/4-0.2 = 0
1/4*n-0.2 = 0 // + 0.2
1/4*n = 0.2 // : 1/4
n = 0.2/1/4
n = 0.8
n = 0.8
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