If it's not what You are looking for type in the equation solver your own equation and let us solve it.
P in (-oo:+oo)
P/(-8)+9 = 13 // - 13
P/(-8)-13+9 = 0
-1/8*P-4 = 0 // + 4
-1/8*P = 4 // : -1/8
P = 4/(-1/8)
P = -32
P = -32
| n^2=-144 | | f(x)=5x^2+6x+7 | | (5f+1)/8=-3 | | 2-(a-4)=4a-(2a+4) | | -14=n/13 | | 8(v+4)-2v=3(2v+1)-8 | | (h-7)/6=1 | | 25x^4+17x^2-8=0 | | 2x=134 | | 5n=(2.75) | | 1+m/3=6 | | 5y*y=10 | | 1/x-3-1/x+6=0 | | 3(5z-8)-4(z+6)= | | w/2+4=5 | | 3x+21/7=8x-15 | | (-4/13)y=6 | | 7y-13=4y | | 3-2a= | | 2x=135 | | 0.5y+0.8=0.1-0.2y | | (d/4)-8=-5 | | -80=8n | | 6h-6+2h=2(4h-3) | | 4s-15=20-s | | -2x+9=9-5x | | 2/(5x)+9/10=13/(2x)+3/5 | | 2(x+y)+a(x+y)= | | (n/5)+6=-2 | | 95/=9 | | -2b-5=8b+1 | | 1/2h+1/3(n-6)=5/6h+2 |