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)
-6 = x/13 // - x/13
-(x/13)-6 = 0
-1/13*x-6 = 0 // + 6
-1/13*x = 6 // : -1/13
x = 6/(-1/13)
x = -78
x = -78
| 117=39x | | 4q+18=-6 | | 3=f/4 | | 117=38x | | -2n^2-5n-8=0 | | 18/100=5/X | | x+38=72 | | c+1=3 | | 10z-9=4z+21 | | X/15=2/15 | | 16x^2+40x=-25 | | 16d+6=4d | | 5y+3x=50 | | -10x-68=73-7x | | 7r+4r-7=5r-19 | | 5x+20=-10x-25 | | h/2=2 | | X-3(x-6)+4(x+1)=7x-10 | | 3e-4-e=6e+16 | | g/3=2 | | -9m^2+5m=0 | | 5x+20=10x+20 | | 1900+30w=2500 | | -21x-4=-17x-8 | | 2x+20+3x-8=180 | | x^4-7x^2+12x-3=0 | | 153/12=-3 | | 9x+3=6x-18 | | X-5(x-2)=7-(2x+5) | | 5w+7=8w-14 | | Logb^243=5 | | 58=(-22)+5t |