If it's not what You are looking for type in the equation solver your own equation and let us solve it.
D( x )
56*x^2-(56*x)-1680 = 0
56*x^2-(56*x)-1680 = 0
56*x^2-(56*x)-1680 = 0
56*x^2-56*x-1680 = 0
56*x^2-56*x-1680 = 0
DELTA = (-56)^2-(-1680*4*56)
DELTA = 379456
DELTA > 0
x = (379456^(1/2)+56)/(2*56) or x = (56-379456^(1/2))/(2*56)
x = 6 or x = -5
x in (-oo:-5) U (-5:6) U (6:+oo)
(7*x^2-175)/(56*x^2-(56*x)-1680) = 0
(7*x^2-175)/(56*x^2-56*x-1680) = 0
56*x^2-56*x-1680 = 0
56*(x^2-x-30) = 0
x^2-x-30 = 0
DELTA = (-1)^2-(-30*1*4)
DELTA = 121
DELTA > 0
x = (121^(1/2)+1)/(1*2) or x = (1-121^(1/2))/(1*2)
x = 6 or x = -5
56*(x+5)*(x-6) = 0
(7*x^2-175)/(56*(x+5)*(x-6)) = 0
7*x^2 = 175 // : 7
x^2 = 25
x^2 = 25 // ^ 1/2
abs(x) = 5
x = 5 or x = -5
x in { -5}
x = 5
| (2x+64)+(7x+9)= | | 5.2a-4.128=-2.8(2.4+7.4a) | | 5y+13=48 | | 5(-4)(-4)+3*-4-10= | | 2t-3/4+5=3t | | 3x-4y=56 | | 2(2m+3)= | | (x^2+4x-7)+(8x^2+9x-7)= | | 2(2x+3)-2=14+6x | | 5(x+4)+3x-9x=6-2x+5+8x | | k/35=8/20 | | (z/6)=(3/10)z+8 | | 15r+20=5r+50 | | 3x^2=6.5 | | (21x+4)+(14x+1)=180 | | 6n-8=2n+16 | | -(3z+4)=6z-3(32+2) | | -2.3=4.1+v/4 | | 4x*x-20x+9=0 | | 7/13x-15/2x+2/13x-4/2x | | 2(x-3)(x+1)=-8 | | 24/r=18/21 | | -84=-7r | | 6x*x-5x-25=0 | | 4a-2a+2= | | x(x+8)=72 | | y/5-2=y/4 | | 8=4m-6 | | n+(n+1)+(n+2)=131 | | 21=w-5.4 | | 4(k-2)-8=4k-(3k-2) | | 10x+1=8-x |