If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9/(-3))*x = 12/x+10 // - 12/x+10
(9/(-3))*x-(12/x)-10 = 0
(9/(-3))*x-12*x^-1-10 = 0
-3*x^1-12*x^-1-10*x^0 = 0
(-3*x^2-10*x^1-12*x^0)/(x^1) = 0 // * x^2
x^1*(-3*x^2-10*x^1-12*x^0) = 0
x^1
-3*x^2-10*x-12 = 0
-3*x^2-10*x-12 = 0
DELTA = (-10)^2-(-12*(-3)*4)
DELTA = -44
DELTA < 0
x in { }
x belongs to the empty set
| 11m+5m-1=65-35 | | y=-5/2*4.5581+10 | | y=4/7*4.5581+10 | | -15=4w-9 | | -5/2x+10=4/7x-4 | | 7x-3y=30 | | 14=-4y+6 | | 9r-20=-62+2r | | 12y^2+7y-10=0 | | 5p-14=-8+6p | | 14=-4y+4 | | 2(3+5x)-5=11 | | y=4/7*4-4 | | 3+.4m=29.5 | | q=50+-5p | | 2x+11-5x=26-(5x+7) | | y=-5/2*10+10 | | -7x-10=20-3x | | 2x-8y=4 | | (6/5)-(3/4)+(1/2) | | y=-5/2(-2.5)+10 | | y=-5/2(-2*5)+10 | | 2x+8=7x-7 | | 15x+19=5x+139 | | 15x+19=5x | | 10-9x=41-16 | | 6x(x-2)-3=2(x-2)(x+2)-4 | | 2x-x^2=-3 | | (5x-1)=3-5(2-x) | | 80/24=70/x | | y=8/7*1.1429-8 | | y=8/7*1.1429*8 |