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m in (-oo:+oo)
m/40 = 2.75 // - 2.75
m/40-2.75 = 0
1/40*m-2.75 = 0 // + 2.75
1/40*m = 2.75 // : 1/40
m = 2.75/1/40
m = 110
m = 110
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