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) = -1/8 // + -1/8
a-(5/8)-(-1/8) = 0
a-5/8+1/8 = 0
a-1/2 = 0 // + 1/2
a = 1/2
a = 1/2
| n+3/4=17/12 | | b-7/8=-47/72 | | 3+m=3 | | w+6=9 | | -16/3=m-6 | | m-3/5=-19/15 | | t/3=4 | | -6+w=-76/11 | | 98/9=x+10 | | 6/7m=12/7 | | n+9=82/9 | | 6/7k=-6/7 | | 15=a+6 | | k+4=14 | | m+1=-3 | | w+7=16 | | w+7/8=79/8 | | x+1/9=-8/9 | | m+1/2=-15/2 | | n+1/5=8/15 | | w-1/2=21/2 | | 9a+4=22 | | 2b=-5/3 | | t-2/5=58/5 | | 9/2=x+4 | | n-2/9=-5/36 | | -2/3n=22/3 | | x^4-3x+20=0 | | -1/2+m=-1/2 | | 2/5n=4/15 | | b+9=33/4 | | 1/6+w=1/6 |