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m in (-oo:+oo)
16/9 = (-4*m)/27 // - (-4*m)/27
16/9-((-4*m)/27) = 0
(4/27)*m+16/9 = 0
4/27*m+16/9 = 0 // - 16/9
4/27*m = -16/9 // : 4/27
m = -16/9/4/27
m = -12
m = -12
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