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-((4/5)*x) = 3 // - 3
x-((4/5)*x)-3 = 0
x+(-4/5)*x-3 = 0
1/5*x-3 = 0 // + 3
1/5*x = 3 // : 1/5
x = 3/1/5
x = 15
x = 15
| 6x-5=15x-45 | | (4/e)+(f/3)=5 | | 4p=5q | | 3+6x=-12 | | 11x^2+150x-500=30000 | | 11x^2+150x-500= | | 3(x+2)-(5-2)=100 | | 5+5+5+5+5=560 | | 2x/3-9=0 | | 4m^2-38m+88=0 | | 5(2-3)-(5-6)= | | ln^2(3x-6)=0 | | 3n+15=5n | | 3x^2-9x=x-20+3x^2 | | x-2/3=52/5 | | 3m-4/2=2m-1 | | 18x^2+6y=0 | | 6x^2+6y=0 | | (25x^-3y^10)/(35x^5y^2) | | 36x^2/(6x)^2 | | (x-10)(x+15)=0 | | 3/x^2-4/x+6=0 | | 5y-20x=900 | | 5y-10x=902 | | 12x+12=98 | | 12x+12=33 | | 5y-10x=900 | | 13x+10=36 | | 5x+40=2x+5x | | -6x^2+6x+3=0 | | 5y-8y+7y-3y+2y= | | 2+2k/3+k=2+2k/6.25 |