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m in (-oo:+oo)
m-5 = 5*m-21 // - 5*m-21
m-(5*m)-5+21 = 0
m-5*m-5+21 = 0
16-4*m = 0 // - 16
-4*m = -16 // : -4
m = -16/(-4)
m = 4
m = 4
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