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m in (-oo:+oo)
m/4 = 100/10 // - 100/10
m/4-(100/10) = 0
m/4-10 = 0
1/4*m-10 = 0 // + 10
1/4*m = 10 // : 1/4
m = 10/1/4
m = 40
m = 40
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