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m in (-oo:+oo)
6-(4*m)-(2*m) = -36 // + 36
6-(4*m)-(2*m)+36 = 0
6-4*m-2*m+36 = 0
42-6*m = 0 // - 42
-6*m = -42 // : -6
m = -42/(-6)
m = 7
m = 7
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