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m in (-oo:+oo)
(-4/9)*m = -3 // + 3
(-4/9)*m+3 = 0
3-4/9*m = 0 // - 3
-4/9*m = -3 // : -4/9
m = -3/(-4/9)
m = 27/4
m = 27/4
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