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m in (-oo:+oo)
m/2 = 1.3 // - 1.3
m/2-1.3 = 0
1/2*m-1.3 = 0 // + 1.3
1/2*m = 1.3 // : 1/2
m = 1.3/1/2
m = 2.6
m = 2.6
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