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m in (-oo:+oo)
(-1/9)*(2*m-16) = (-1/3)*(2*m+4) // - (-1/3)*(2*m+4)
(-1/9)*(2*m-16)-((-1/3)*(2*m+4)) = 0
(-1/9)*(2*m-16)+(1/3)*(2*m+4) = 0
1/3*(2*m+4)-1/9*(2*m-16) = 0
1/3*(2*m+4)-1/9*(2*m-16) = 0
4/9*m+28/9 = 0
4/9*m+28/9 = 0
4/9*m+28/9 = 0 // - 28/9
4/9*m = -28/9 // : 4/9
m = -28/9/4/9
m = -7
m = -7
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