If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x*((4*(8*x-2))/3) = 20 // - 20
x*((4*(8*x-2))/3)-20 = 0
(4*x*(8*x-2))/3-20 = 0
(4*x*(8*x-2))/3+(-20*3)/3 = 0
4*x*(8*x-2)-20*3 = 0
32*x^2-8*x-60 = 0
32*x^2-8*x-60 = 0
4*(8*x^2-2*x-15) = 0
8*x^2-2*x-15 = 0
DELTA = (-2)^2-(-15*4*8)
DELTA = 484
DELTA > 0
x = (484^(1/2)+2)/(2*8) or x = (2-484^(1/2))/(2*8)
x = 3/2 or x = -5/4
4*(x+5/4)*(x-3/2) = 0
(4*(x+5/4)*(x-3/2))/3 = 0
(4*(x+5/4)*(x-3/2))/3 = 0 // * 3
4*(x+5/4)*(x-3/2) = 0
( x+5/4 )
x+5/4 = 0 // - 5/4
x = -5/4
( x-3/2 )
x-3/2 = 0 // + 3/2
x = 3/2
x in { -5/4, 3/2 }
| 7x+5x-5=-5+12x | | 40x^5+32x+25x^3= | | 18x^9+50x^5+49x^7= | | 10p-35+8p=19 | | -5t^2+15t=0 | | 5d-14=8d+4 | | 75=5(-4+2x) | | -5t^2-15t=0 | | 55+20x=88 | | 2y^2+4y=-2 | | 3+12x=9+2x+4 | | 2/3x-3+1/3=-5/3 | | 3+12x=9+2x+43 | | (4+9i)(4-9i)= | | 5/8-1/2x=1/2 | | (x^2)+(y^2)=85 | | 2(4+3y)+y=8 | | 2x^2-y^2+4=0 | | 16/14=x/2 | | 4[x-2]=3[x-3] | | 6-(x+7)-(3x-5)=-2x-10 | | 4r-4+6r=3+8r | | 15/x=6/10 | | 1-5y=11 | | 3n+8-5=0 | | -55=2x-7x+5 | | 25xy=5 | | 4(4k+2)-8(k-2)=3(2k+3)-1 | | 2/3x-3+1/3 | | 49=-7[t+1] | | 4x+6.9=5x-6.1 | | 4y+y^2=12 |