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m in (-oo:+oo)
(m-9)/4+3 = m/3 // - m/3
(m-9)/4-(m/3)+3 = 0
(m-9)/4-m/3+3 = 0
(3*(m-9))/(3*4)+(4*(-m))/(3*4)+(4*3^2)/(3*4) = 0
3*(m-9)+4*(-m)+4*3^2 = 0
36-m-27 = 0
9-m = 0
(9-m)/(3*4) = 0
(9-m)/(3*4) = 0 // * 3*4
9-m = 0
9-m = 0 // - 9
-m = -9 // * -1
m = 9
m = 9
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