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M in (-oo:+oo)
5 = (2*M)/3+9 // - (2*M)/3+9
5-((2*M)/3)-9 = 0
(-2/3)*M-9+5 = 0
-2/3*M-4 = 0 // + 4
-2/3*M = 4 // : -2/3
M = 4/(-2/3)
M = -6
M = -6
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