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)
x-4/7 = -81/7 // + -81/7
x-4/7-(-81/7) = 0
x-4/7+81/7 = 0
x+11 = 0 // - 11
x = -11
x = -11
| -2/9+b=19/36 | | a+8=97/12 | | 12=t+6 | | d+6/7=11/21 | | -2/3=t+1/3 | | 3=d-3 | | -1/3+a=2/3 | | d-3/10=97/10 | | -2/7x=-2 | | x-4/9=-103/9 | | -32/5=x-2/5 | | 9/20=x+3/4 | | 11/24=t-1/8 | | k/7=-1/3 | | 6+x=-1 | | -75/8=w-10 | | w-6=0 | | t+7=11 | | -2/3+m=10/3 | | m-2=-6/5 | | t+5/8=85/8 | | k+1=4/3 | | -5/9+t=13/36 | | 5w=1 | | a+3/4=-33/4 | | w+3/5=38/5 | | -1+w=-5/8 | | a+1/2=21/2 | | a+5/6=-31/6 | | a+2/5=11/15 | | t-3/7=60/7 | | 1/4+d=43/44 |