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x in (-oo:+oo)
3*a = (18-(8*m))/3 // - (18-(8*m))/3
3*a-((18-(8*m))/3) = 0
3*a-((18-8*m)/3) = 0
(-1*(18-8*m))/3+3*a = 0
(-1*(18-8*m))/3+(3*3*a)/3 = 0
3*3*a-1*(18-8*m) = 0
9*a+8*m-18 = 0
(9*a+8*m-18)/3 = 0
(9*a+8*m-18)/3 = 0 // * 3
9*a+8*m-18 = 0
x belongs to the empty set
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