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m in (-oo:+oo)
6*m-(2*m)-4 = 40 // - 40
6*m-(2*m)-40-4 = 0
6*m-2*m-40-4 = 0
4*m-44 = 0 // + 44
4*m = 44 // : 4
m = 44/4
m = 11
m = 11
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