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+20 = 0
x+20 = 0
x+20 = 0
x+20 = 0 // - 20
x = -20
x in (-oo:-20) U (-20:+oo)
5600/(x+20) = 2*x-20 // - 2*x-20
5600/(x+20)-(2*x)+20 = 0
5600/(x+20)-2*x+20 = 0
5600/(x+20)+(-2*x*(x+20))/(x+20)+(20*(x+20))/(x+20) = 0
20*(x+20)-2*x*(x+20)+5600 = 0
20*x-2*x^2-40*x+400+5600 = 0
6000-2*x^2-20*x = 0
6000-2*x^2-20*x = 0
2*(3000-x^2-10*x) = 0
3000-x^2-10*x = 0
DELTA = (-10)^2-(-1*4*3000)
DELTA = 12100
DELTA > 0
x = (12100^(1/2)+10)/(-1*2) or x = (10-12100^(1/2))/(-1*2)
x = -60 or x = 50
2*(x+60)*(x-50) = 0
(2*(x+60)*(x-50))/(x+20) = 0
(2*(x+60)*(x-50))/(x+20) = 0 // * x+20
2*(x+60)*(x-50) = 0
( x+60 )
x+60 = 0 // - 60
x = -60
( x-50 )
x-50 = 0 // + 50
x = 50
x in { -60, 50 }
| y=1.5x-18 | | 9h-5=94 | | (-3)-(3)=x | | -(t^2+t-30)= | | 1/3x6/11 | | p=5s+6/6 | | 2d^2-10d+12=0 | | (x-3)+x=4+x | | d^2-3d+2=0 | | 4x+1/2y=1 | | -2x-3=2x+1 | | 5(3y+29)=-y-15 | | 18-6=(5-g) | | 2a-6b=-18 | | 6(1)+(-4)=10(-1) | | 27-6x=3x+15 | | x^2+kx-8x-4k+15=0 | | 30a^7+16a^6+9a^8= | | 19=a+72 | | x/x-2+2=2x-2/x-2 | | 7-10x=163-38x | | 2x^2-30x-3500=0 | | 4(3x-6)/2x=5 | | 4(3x-6)/2x=5 | | 3.25-5=5-1.85 | | x^2+k-8x-4k+15=0 | | -3(x+5)=9 | | 9q+16for=8 | | 5-2.8=0.8b+1.2 | | 3X^2+44x-6279=0 | | x/a-5=b | | (3x^2y^-3)^3/54x^-8y^-10 |