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m in (-oo:+oo)
57 = 4*m+2*m+9 // - 4*m+2*m+9
57-(4*m)-(2*m)-9 = 0
57-4*m-2*m-9 = 0
48-6*m = 0 // - 48
-6*m = -48 // : -6
m = -48/(-6)
m = 8
m = 8
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