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m in (-oo:+oo)
(1/2)*(3*m+1) = (9*m)/4 // - (9*m)/4
(1/2)*(3*m+1)-((9*m)/4) = 0
(1/2)*(3*m+1)+(-9/4)*m = 0
1/2*(3*m+1)+(-9*m)/4 = 0
(1/2*4*(3*m+1))/4+(-9*m)/4 = 0
1/2*4*(3*m+1)-9*m = 0
2-3*m = 0
(2-3*m)/4 = 0
(2-3*m)/4 = 0 // * 4
2-3*m = 0
2-3*m = 0 // - 2
-3*m = -2 // : -3
m = -2/(-3)
m = 2/3
m = 2/3
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