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n in (-oo:+oo)
n/7.5 = 4 // - 4
n/7.5-4 = 0
0.13333333*n-4 = 0 // + 4
0.13333333*n = 4 // : 0.13333333
n = 4/0.13333333
n = 30.00000075
n = 30.00000075
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