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m in (-oo:+oo)
4*(-(2*m)-4) = -8 // + 8
4*(-(2*m)-4)+8 = 0
4*(-2*m-4)+8 = 0
4*(-2*m-4)+8 = 0
-8*m-8 = 0
-8*m-8 = 0
-8*m-8 = 0 // + 8
-8*m = 8 // : -8
m = 8/(-8)
m = -1
m = -1
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