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m in (-oo:+oo)
(1/3)*(2*m-10) = (2/3)*m+10 // - (2/3)*m+10
(1/3)*(2*m-10)-((2/3)*m)-10 = 0
(1/3)*(2*m-10)+(-2/3)*m-10 = 0
1/3*(2*m-10)+(-2*m)/3-10 = 0
(1/3*3*(2*m-10))/3+(-2*m)/3+(-10*3)/3 = 0
1/3*3*(2*m-10)-2*m-10*3 = 0
-30-10 = 0
-40 = 0
-40/3 = 0
-40/3 = 0 // * 3
-40 = 0
m belongs to the empty set
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