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m in (-oo:+oo)
(2*m)/5 = (1/3)*(2*m-18) // - (1/3)*(2*m-18)
(2*m)/5-((1/3)*(2*m-18)) = 0
(-1/3)*(2*m-18)+(2*m)/5 = 0
(2*m)/5-1/3*(2*m-18) = 0
(-1/3*5*(2*m-18))/5+(2*m)/5 = 0
2*m-1/3*5*(2*m-18) = 0
30-4/3*m = 0
(30-4/3*m)/5 = 0
(30-4/3*m)/5 = 0 // * 5
30-4/3*m = 0
30-4/3*m = 0 // - 30
-4/3*m = -30 // : -4/3
m = -30/(-4/3)
m = 45/2
m = 45/2
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