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m in (-oo:+oo)
m/4.25 = 4 // - 4
m/4.25-4 = 0
0.23529412*m-4 = 0 // + 4
0.23529412*m = 4 // : 0.23529412
m = 4/0.23529412
m = 16.99999983
m = 16.99999983
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