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m in (-oo:+oo)
m/5 = 0.2 // - 0.2
m/5-0.2 = 0
1/5*m-0.2 = 0 // + 0.2
1/5*m = 0.2 // : 1/5
m = 0.2/1/5
m = 1
m = 1
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