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*x-(3/7) = -199/105 // + -199/105
(2/3)*x+3*x-(3/7)-(-199/105) = 0
(2/3)*x+3*x-3/7+199/105 = 0
11/3*x+22/15 = 0 // - 22/15
11/3*x = -22/15 // : 11/3
x = -22/15/11/3
x = -2/5
x = -2/5
| 1-3/7x-7x=527/7 | | 7/9+2x+x=89/45 | | -3/4x-3-2/3x=-155/12 | | 7/9+6x+3/7x=2074/63 | | -6x+5/7+1/7x=-3/4 | | 3/5=-3/5x+1/2x+1/2 | | 1/2x+7/10+7x=191/5 | | 4x+9+5/6x=-69/2 | | 12=7x+4x+1 | | 2x+1/2+6x=59/22 | | 2593/770=5x+3/7x+9/10 | | 6+5/6x-2x=-8 | | 2x+10-1/5x=47/5 | | 153/49=5/7x-4/7x+3 | | -4/7x+1/2+5/6x=37/63 | | -41/66=-2/3x+3/4x-2/3 | | 6/7+2x-x=83/7 | | 1/3x+6-x=8 | | 1/2x+6+1/2x=12 | | x+7/9+3x=107/45 | | 4+x+5x=52 | | -1/2+2x+x=0 | | -x-3/8+x=-3/8 | | -6/7x-3-6/7x=-141/7 | | 2-1/2x+3/5x=221/110 | | -x+4+4x=37 | | 1/3x-2/3+2x=53/36 | | 57/5=3x+3/5x+9 | | 2x-1+1/3x=-53/18 | | 1+1/2x-1/2x=1 | | 33/16=-3/4x-6x-3 | | 1-5x+1/2x=65/2 |