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)
(-2/3)*x-((3/4)*x)-8 = -185/21 // + -185/21
(-2/3)*x-((3/4)*x)-(-185/21)-8 = 0
(-2/3)*x+(-3/4)*x+185/21-8 = 0
17/21-17/12*x = 0 // - 17/21
-17/12*x = -17/21 // : -17/12
x = -17/21/(-17/12)
x = 4/7
x = 4/7
| 3-x+2x=29/9 | | 5x-4+4x=95 | | 4-5/7x+2/3x=677/168 | | 3/7x-8+1/6x=-311/42 | | -3/4x-4/7+1/4x=13/14 | | 3/7-1/2x+4x=-25/56 | | -271/90=-3/4x-4x-9/10 | | 1+4x+5x=7 | | 26/7=2x+2x-2/7 | | -7+1/2x+x=-127/16 | | -1/5-1/3x+x=-11/5 | | 2x-2/7+x=-149/7 | | -2/5-5x+1/2x=-47/5 | | 7x=x^2-5 | | 2/3+6x+4/7x=1258/231 | | 3/7x+2+3x=142/35 | | -2/3x+2/5-1/2x=-23/30 | | -x+1/3-6x=-146/3 | | -49/9=3x-6x+5/9 | | 10-2/7x+2/5x=1042/105 | | 2/3=4/5x-5/6x+9/10 | | -223/3=-7x-1/3x-1 | | 5x+1/5-1/2x=-313/10 | | 10+2x+x=47/4 | | -1/2x+1/2+x=1/2 | | -2/7-6x+7x=18/35 | | 6x+2/3+6/7x=-1714/21 | | x+2/9+4/7x=113/63 | | 5x+4/7+2x=298/7 | | 5x-2+1/2x=-27/8 | | 4=-x+5x+1 | | 7-6x+3/7x=-185/7 |