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)
6*a-10 = a-30 // - a-30
6*a-a-10+30 = 0
5*a+20 = 0 // - 20
5*a = -20 // : 5
a = -20/5
a = -4
a = -4
| -6+4d=-7d+115 | | -3k+5=2k+5 | | -6a-8=6+a | | 5+4k=7k-1 | | x+4=5x-44 | | -5+3w=5w-19 | | -2b-1=-b-1 | | -n+8=-72+7n | | 7w-5=2w-60 | | 1+2b=-7b+73 | | 4k+5=k+38 | | 3w+6=-4w-57 | | 2b+8=-22-b | | -4n+10=n-25 | | -7a+3=-74+4a | | -6b+4=-b+4 | | 2t-5=3t-15 | | -6x+9=5x+42 | | 4t-1=-3t+62 | | 2d+6=42-2d | | -k+3=7k-5 | | -3+2x=4x-23 | | 3k-2=-2+2k | | -7n+3=-21-5n | | -5x-7=14-2x | | 3+2x=-x+15 | | 3x-8=-2+2x | | 3d+1=7d-7 | | 10-7b=-6b+17 | | -3+6m=-4m+17 | | m+10=-17+4m | | -7-3t=2t+13 |