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m in (-oo:+oo)
8-(4*m) = 5*m-64 // - 5*m-64
8-(4*m)-(5*m)+64 = 0
8-4*m-5*m+64 = 0
72-9*m = 0 // - 72
-9*m = -72 // : -9
m = -72/(-9)
m = 8
m = 8
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