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-2)/3-(21*x) = 0
(x-2)/3-21*x = 0
(x-2)/3+(-21*3*x)/3 = 0
x-21*3*x-2 = 0
-62*x-2 = 0
(-62*x-2)/3 = 0
(-62*x-2)/3 = 0 // * 3
-62*x-2 = 0
-62*x-2 = 0 // + 2
-62*x = 2 // : -62
x = 2/(-62)
x = -1/31
x = -1/31
| 1/2(k-7)=3 | | 105x+490=350x-735 | | (Y^2+31)+(8y-4)=180 | | (6m-11)(4m-6)=0 | | x^5y^5-x^2y^2=0 | | x^2-84x+396=0 | | (4x/5b)(25bx/2x^4) | | X+9+24=64 | | 6(3x-12)=24x+8 | | B=(50e)+31 | | 3(-x+2)-(6x+4)=x-2-21x | | 53.72/6 | | 8m+5-4=2m+5 | | -25h=100 | | 1.0p=5.04 | | 1-9n=-46 | | f(1/8)=2(5)^x | | -20=-120-f | | 120y^2+4y-4=0 | | 360=30d | | 23.89-3n=14.02 | | x^2-4x+-1=0 | | 35/64/7/32 | | -30=s-3 | | 18n+3N^2=176.75 | | 5x+4=6x-13 | | -300=60r | | -25=-25+z | | 3x-x+5=2x+8-3 | | 10.39=-log(x) | | n6/11=83/n | | 3x-x+5=2x+8-4 |