If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
a/(-5) = 8 // - 8
a/(-5)-8 = 0
-1/5*a-8 = 0 // + 8
-1/5*a = 8 // : -1/5
a = 8/(-1/5)
a = -40
a = -40
| 0.09y=-0.05 | | 9y=-0.05 | | =4e+9 | | 9+6s=10 | | 2x+4x-3x=14-2 | | 8y+2x=4 | | y=x^2+5x+3 | | 69x69/69 | | 113-y=230 | | 3*x+4*y=13 | | 15+9z-6z^2= | | X-5*4+7=Y | | 7-7x-3(x+4)=-4(x+2)-4x | | 3/2p-14=4f-t | | ax-3=5x+a | | (x-2)(x+5)=9 | | 3t+nt= | | -4x-13=8 | | 8h+7=87 | | 7+11s-6=9s+19-7s | | 7+11s-6=9s+19-7 | | -4x-5=13 | | 10(t-4)+8t=6(3t+5)-13 | | 17x+14=17x-14 | | 14(t-4)+4t=6(3t+3)-12 | | 40-15x=55 | | 7+5r-3=9r+6-2r | | 4+x*3=9-2*x | | 12x+13=12x-13 | | x^4+2x^3+3x^2-2x+1=0 | | 3x+10+17x-7=-6-2x+51+x | | (4y-9)(1+y)=0 |