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)
(2/5)*(2*x+1) = 3*(2-(4*x))+20 // - 3*(2-(4*x))+20
(2/5)*(2*x+1)-(3*(2-(4*x)))-20 = 0
(2/5)*(2*x+1)-3*(2-4*x)-20 = 0
2/5*(2*x+1)-3*(2-4*x)-20 = 0
2/5*(2*x+1)-3*(2-4*x)-20 = 0
64/5*x-20-28/5 = 0
64/5*x-128/5 = 0
64/5*x-128/5 = 0
64/5*x-128/5 = 0 // + 128/5
64/5*x = 128/5 // : 64/5
x = 128/5/64/5
x = 2
x = 2
| 1/4-(-5/8) | | -4+14= | | 4x+16=56-5x | | 2h^2-62h+456=0 | | 109-4x=14x+23 | | -1-19=-8v-2v | | cosx-sinx=0.5 | | -1(-y-1)= | | 3n-5=7n-13 | | 14a+9=93 | | -1(-y)= | | 6(15+9)= | | 1y+1=15-3/4y | | y(2y^2-13y-7)=0 | | 0=x^2+kx+2k | | 5ln(5x)=25 | | 9x+2=10y | | 5lnx=15 | | 0.16-0.01(x-2)=-0.03(2-x) | | 8x=27+5x | | 45=6+3x | | 7x+43x+5= | | 2x-(5)=4x | | 1.22x=6.10 | | ((a^2*b^-3)/(a^-4))*b^2 | | 38-7x=2-4x | | 2(5+x)=3x | | x+12/3=4 | | =60 | | (a^2b^-3)/a^-4b^2 | | (X+4)-in(x+4)=in(x-2) | | 3-2x=0.1 |