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m in (-oo:+oo)
(4*m)/3-m = 3*(m+1) // - 3*(m+1)
(4*m)/3-(3*(m+1))-m = 0
(4*m)/3-3*(m+1)-m = 0
(-3*3*(m+1))/3+(4*m)/3+(3*(-m))/3 = 0
4*m-3*3*(m+1)+3*(-m) = 0
-5*m-3*m-9 = 0
-8*m-9 = 0
(-8*m-9)/3 = 0
(-8*m-9)/3 = 0 // * 3
-8*m-9 = 0
-8*m-9 = 0 // + 9
-8*m = 9 // : -8
m = 9/(-8)
m = -9/8
m = -9/8
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