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^2-(3*x)-4 = 0
x+1 = 0
x-4 = 0
x^2-(3*x)-4 = 0
x^2-(3*x)-4 = 0
x^2-3*x-4 = 0
x^2-3*x-4 = 0
DELTA = (-3)^2-(-4*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+3)/(1*2) or x = (3-25^(1/2))/(1*2)
x = 4 or x = -1
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:-1) U (-1:4) U (4:+oo)
x/(x-4)+4/(x+1) = (19*x-1)/(x^2-(3*x)-4) // - (19*x-1)/(x^2-(3*x)-4)
x/(x-4)+4/(x+1)-((19*x-1)/(x^2-(3*x)-4)) = 0
x/(x-4)+4/(x+1)-((19*x-1)/(x^2-3*x-4)) = 0
x/(x-4)+4/(x+1)+(-1*(19*x-1))/(x^2-3*x-4) = 0
x^2-3*x-4 = 0
x^2-3*x-4 = 0
x^2-3*x-4 = 0
DELTA = (-3)^2-(-4*1*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+3)/(1*2) or x = (3-25^(1/2))/(1*2)
x = 4 or x = -1
(x+1)*(x-4) = 0
x/(x-4)+4/(x+1)+(-1*(19*x-1))/((x+1)*(x-4)) = 0
(x*(x+1))/((x-4)*(x+1))+(4*(x-4))/((x-4)*(x+1))+(-1*(19*x-1))/((x-4)*(x+1)) = 0
x*(x+1)+4*(x-4)-1*(19*x-1) = 0
x^2+5*x-19*x-16+1 = 0
x^2-14*x-15 = 0
x^2-14*x-15 = 0
x^2-14*x-15 = 0
DELTA = (-14)^2-(-15*1*4)
DELTA = 256
DELTA > 0
x = (256^(1/2)+14)/(1*2) or x = (14-256^(1/2))/(1*2)
x = 15 or x = -1
(x+1)*(x-15) = 0
((x+1)*(x-15))/((x-4)*(x+1)) = 0
((x+1)*(x-15))/((x-4)*(x+1)) = 0 // * (x-4)*(x+1)
(x+1)*(x-15) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-15 )
x-15 = 0 // + 15
x = 15
x in { -1}
x = 15
| 5x-(8-x)=4x-10 | | 26-12=2(x-4) | | -1/2=x | | 18-x/5=10 | | 16-3x=8x-17 | | 25-6x=18+x | | -3/4(x+2/3)=4/5(x-1/2) | | x-5x+7=6-4x+1 | | 50-3x=26 | | -4(t-2)+8t=6t-7 | | 1,8x+x=0 | | x+8x^2=100 | | 5(z+2)=5z+12 | | 5(x+6)/4=4x-5 | | (x+8)*2=100 | | 5(c+6)/4=4x-5 | | x^2+4x-22=-3x-4 | | 5-6n=2n-11 | | 0.40x+0.25(40)=0.20(148) | | x^2+4x-6=6 | | -6y+7x=-9 | | -4y+8=-2(4y+12) | | 300m+5=s | | 8c^2+22c-21=0 | | 4x+c=81-4x | | 5+.50x=20 | | -(7y+5)-(-6y-8)=3 | | -18+6x=14-10x | | (y+7)(y-3)= | | 38+6a=32 | | 287-3x=42x+22 | | X^2-(1/4)x-(35/64)=0 |