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)
7*((5/21)*x-(6/7)) = 0
7*((5/21)*x-6/7) = 0
7*(5/21*x-6/7) = 0
( 5/21*x-6/7 )
5/21*x-6/7 = 0 // + 6/7
5/21*x = 6/7 // : 5/21
x = 6/7/5/21
x = 18/5
( 7 )
7 = 0
x belongs to the empty set
x = 18/5
| 18-2v=-2(1-v) | | 6k-3k=18 | | 3+4(1+5n)=-6+7n | | 3(2s-2)-4s=-18 | | -13=25-25+y | | 8(6m)= | | 7x-11=12x-3+6 | | -2r+2r=-2r+12 | | 8x9/118= | | 9x-7y=56 | | 57x-23(4+(-x-(5)))+2=99 | | 0.5x-3=-0.33x+2 | | (1/4)x-10=50 | | 3(sinx+1)=sinx+4 | | -1=3+2x | | 250,000/36= | | 4[8-(-9x-4)]=216x+128 | | 2/x-7/-5-1 | | 57x-23(4+(-x-(5)))+21=99 | | 15(1/2)=2/3x-1/2 | | -(5x-3)-8=2(2x+1) | | m/9+3=4 | | x-8=-7+9 | | (x/9)=x-40 | | 7b+3=1+4b+5b | | x-5+5x+5=180 | | -1.56/-7.8 | | 8/4x=-6 | | -84-3(7p-2)-8p= | | 4+5v-4-6v=-6v+5 | | C/(-4)=10 | | a+4/4=0 |