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m in (-oo:+oo)
m/4 = 2*2 // - 2*2
m/4-(2*2) = 0
m/4-4 = 0
1/4*m-4 = 0 // + 4
1/4*m = 4 // : 1/4
m = 4/1/4
m = 16
m = 16
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