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m in (-oo:+oo)
-(4*m)-1/4 = 79/4 // - 79/4
-(4*m)-1/4-(79/4) = 0
-4*m-1/4-79/4 = 0
-4*m-20 = 0 // + 20
-4*m = 20 // : -4
m = 20/(-4)
m = -5
m = -5
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