If it's not what You are looking for type in the equation solver your own equation and let us solve it.
f in (-oo:+oo)
(-4/5)*f = -3 // + 3
(-4/5)*f+3 = 0
3-4/5*f = 0 // - 3
-4/5*f = -3 // : -4/5
f = -3/(-4/5)
f = 15/4
f = 15/4
| 39=15+r | | 3/4n=5.25 | | 3n^2+14n-24=0 | | 0.6x+0.75=0.583 | | x*x=-9x+-3 | | x=a(1-x)+1 | | x+0.25x+0.015x=100 | | x=-9x-3 | | 3-6xa=21 | | x-(.36x)=25000000 | | 8x+1(-3x+7)=17 | | -4(3k+5)=-16k | | m(x)=6x^4-17x^3+8x^2-3 | | (.36x)+x=25000000 | | 5x^2+15x+28=0 | | x=-9x-5 | | 3y-18=-5y+36 | | c=1.5h+3 | | (.36x)+x=2500000 | | 4y+1-y=10 | | 2x^2-(m-1)x+(m+1)=0 | | -2(r+9)=-33 | | 24/14=x/21 | | .36x+x=2500000 | | .2(3x+.25)=4[0.2x+(-4)]-10 | | 21p^2-20p+4=0 | | 17=8x+5-2x | | 2x+27=2-3x | | 7=3(x+2)-3(x-5) | | x*x=-9x-5 | | b-8+8b=32 | | 7+2(x+4)=3(3x+5) |