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m in (-oo:+oo)
m/1.4 = 5 // - 5
m/1.4-5 = 0
0.71428571*m-5 = 0 // + 5
0.71428571*m = 5 // : 0.71428571
m = 5/0.71428571
m = 7.00000004
m = 7.00000004
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