If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( m )
9*m = 0
9*m = 0
9*m = 0
9*m = 0 // : 9
m = 0
m in (-oo:0) U (0:+oo)
(m-12)/(9*m) = 5/9 // - 5/9
(m-12)/(9*m)-(5/9) = 0
(m-12)/(9*m)-5/9 = 0
(9*(m-12))/(9*9*m)+(-5*9*m)/(9*9*m) = 0
9*(m-12)-5*9*m = 0
-36*m-108 = 0
(-36*m-108)/(9*9*m) = 0
(-36*m-108)/(9*9*m) = 0 // * 9*9*m
-36*m-108 = 0
-36*m-108 = 0 // + 108
-36*m = 108 // : -36
m = 108/(-36)
m = -3
m = -3
| m-12/9m=5/9 | | 5/6+x-1/5 | | 5x+40=12x+30 | | x+8/12=5/6+x-1/5 | | 7/6t=-4/7 | | 12c-8-(-2c)= | | -6x+2-5x+7+1x=39 | | m-98=144 | | 7-5x=9-3x-(10/5(64)+2x) | | 3x+6+4x=9 | | 3x-4-5x=4+x | | 15-2x+3= | | 5-13=-4z | | x^2+38x+217=25 | | 2x^2-5x+8=7 | | g(x)=x^2+10x+23 | | -4(x+5)=24 | | -1/2x+7=x-8 | | (10/5(4+(4)(4)(4))+2x) | | 4z=1.4+3.4 | | 7-5x=9-3x-(10/5(4+(4)(4)(4))+2x) | | 0=6x^2-9x+2 | | 3x+31=180 | | -2x+x(-2x)=x-6 | | (5x-27)=180 | | 32y-12z=0 | | 21+4x-7x=-3 | | ax^2+4x+b=0 | | 3y=-8x+20 | | 7=d/-2 | | (x+4)(x-3)=(x-1)(x-8) | | 18+7x+2=0 |