If it's not what You are looking for type in the equation solver your own equation and let us solve it.
d in (-oo:+oo)
4-(4*d) = -12 // + 12
4-(4*d)+12 = 0
4-4*d+12 = 0
16-4*d = 0 // - 16
-4*d = -16 // : -4
d = -16/(-4)
d = 4
d = 4
| 5+2b=25 | | -3/5+2d=-3/5 | | 4/5+1/3x=62/15 | | 2/7x+8=62/7 | | x^3-x^2-25x+150=0 | | 7t-5/8=107/8 | | -7/10+7t=14/5 | | 3+5w=18 | | b+1/10=11/10 | | 3-m=2 | | -1/2n-5/9=-34/45 | | 3(x+2)=12-x | | 3/4b-8=-133/16 | | -7+4m=-61/11 | | -2/3m-9=-83/9 | | -1/3k-5=-58/11 | | 6/7n+3=117/35 | | k+1/2=17/18 | | 1/3-3/5w=77/15 | | -42/5-6/5=x | | 1+2/7m=-15/7 | | -2/5m-1=-7/5 | | 8/9+2k=76/45 | | -2/9-2m=-13/18 | | 1-1/2a=-1/2 | | 3+5k=11/2 | | 1/2b-4/5=7/10 | | 6/7-7n=55/7 | | 5/6+4a=197/6 | | 4k+3=19 | | -4/7t-7=-519/77 | | m+3=15 |