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-(7/9) = 133/72-4*a // - 133/72-4*a
-a-(-4*a)-(7/9)-(133/72) = 0
4*a-a-7/9-133/72 = 0
3*a-21/8 = 0 // + 21/8
3*a = 21/8 // : 3
a = 21/8/3
a = 7/8
a = 7/8
| 2/7+2a=5a-145/7 | | 1/4m+5/6=-7m+331/84 | | 4x+6=3x+10 | | 1-1/5a=2/7a-10/7 | | x-9.75=9.75 | | 6d+4/5=-1/2d-317/10 | | 3/4n+1=4n+1 | | -4/7d+10=d+48/7 | | -7m+10=-3/4m+205/48 | | 7m+10=6m+20 | | -6b+1/5=-5/6b+781/30 | | t-2/7=-109/14-1/2t | | -6b+3=4b+2 | | 4/5m+7/8=5/6m+313/360 | | 1+3m=7m+33 | | (2c+7)(3c-4)=12 | | k+9=-2/3k+82/3 | | -1/3w-2/7=6/7w-102/7 | | 2/3x-2=-4x+1/3 | | -8+3/4a=4/7a-27/4 | | 2/5+2/5m=-m+44/5 | | n-4/5=2n-13/10 | | 3w-9=126/5-4/5w | | -1/4-4a=4/7a+235/84 | | 17x^2=34 | | 7m+9=-454/7+2/7m | | 5/7n-1/8=-33/56+1/4n | | 1/3x+8=6x+236/21 | | 4/5x-2/3=4/5x-2/3 | | 3/7a+1/2=-6/7a+1/2 | | 5+7w=5w+41/7 | | 2t+4=40+6t |