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m in (-oo:+oo)
3*m^2-((75/6)*m^2)+((30*m)/4)*m-((20/9)*m^2)+45*m = 0
3*m^2+(-25/2)*m^2+((30*m)/4)*m+(-20/9)*m^2+45*m = 0
45*m-38/9*m^2 = 0
DELTA = 45^2-(-38/9*0*4)
DELTA = 2025
DELTA > 0
m = (2025^(1/2)-45)/(-38/9*2) or m = (-2025^(1/2)-45)/(-38/9*2)
m = 0 or m = 405/38
m in { 0, 405/38 }
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