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-((20*x)/100) = 3000 // - 3000
x-((20*x)/100)-3000 = 0
x+(-1/5)*x-3000 = 0
4/5*x-3000 = 0 // + 3000
4/5*x = 3000 // : 4/5
x = 3000/4/5
x = 3750
x = 3750
| 5-9x=32-16x | | 1/6(7-2i)+2/3(5-51) | | 92=4x | | 3x+12=x+16 | | 4(5a+3)-5(2a-1)=27 | | 3(4x-2)-5x=30-x | | 5/(x+2)+3/(x+2)=12/(x^2-4) | | 5x+3+x-9=-3+4x+3 | | 9x+3=33+3x | | -23/4-12/3 | | f(3a)=5x-2x^2 | | x-(2*x)=30000 | | x/4.8=6/3.2 | | x+13=-13 | | Z(z^3+1)=4+z^4 | | (2x-2)(x-2)=0 | | 3(x+4)/2+1=-7 | | 5x^2-3=-28 | | -24=6y-4(8/7x-8) | | 3b-5-8b=0 | | x(3x+4)=5 | | (1/4)x^2-x+1=0 | | 15y-y= | | 3x^5y^3/18x^3y^8 | | -3=-2x^2-4x+1 | | 3x+(y+78)=180 | | 3x-3=11x-72 | | x(7)=40 | | 2x-3x-4/1y-9y=10 | | 100-3x=2x+35 | | 5v^2-7v-53=0 | | 4+5n=4-2n |