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)*x+6 = 146/21 // - 146/21
x+(2/3)*x-(146/21)+6 = 0
x+(2/3)*x-146/21+6 = 0
5/3*x-20/21 = 0 // + 20/21
5/3*x = 20/21 // : 5/3
x = 20/21/5/3
x = 4/7
x = 4/7
| -6+x-7x=-6/5 | | 1/5x-5+2/5x=-43/5 | | 4+x+3/7x=94/21 | | 1/3x-4-2x=43/3 | | 3x+3/4+6/7x=111/4 | | 1-x+3x=11 | | -91/44=-x-x-1/4 | | -5/9-2/7x+2/5x=-1333/2205 | | 1/3+x+x=1/3 | | 2/5+1/4x+3/4x=39/35 | | 3x+4/7-x=128/77 | | 2/5x+6+3/5x=14 | | -233/70=x+5x+1/10 | | 7x+2/9+3x=-518/99 | | 6x-1-1/3x=-23/6 | | 4x-4/5+6/7x=256/105 | | a^2+19a+18= | | 10-1/2x+4/7x=10 | | 5n-14=20 | | -3/4+6x+6x=429/4 | | 8+3x-6x=-22 | | 1/3-5x+7x=73/3 | | 1/2x-1/6+1/4x=13/3 | | 58/5=x+4/7x+3/5 | | 774/35=-4/5x+4x-2/7 | | 4/5x-3/8+4x=189/8 | | 5+x+x=-5 | | -1/10+1/6x+2/7x=53/420 | | 4x-2-5x=-27/11 | | 3x+3+7x=10 | | 2/5x+3/5+3x=-11/10 | | 3x+7-5x=19/3 |