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)
(6/7)*x+7 = 3*x+141/28 // - 3*x+141/28
(6/7)*x-(3*x)-(141/28)+7 = 0
(6/7)*x-3*x-141/28+7 = 0
55/28-15/7*x = 0 // - 55/28
-15/7*x = -55/28 // : -15/7
x = -55/28/(-15/7)
x = 11/12
x = 11/12
| -2/3x-3/8=-3/8-2/3x | | 5/7x-2=4/5x-103/35 | | -1+3/5x=1/5x-29/35 | | 5x+2/7=-2/7x-348/77 | | 4+5x=x+20 | | 2/3x-1/2=-5/3+3x | | 1-1/3x=-7x-37/3 | | 6+2x=-5x+27 | | 1/3+1/6x=-5x-28/9 | | -3/4x+10=243/32+2x | | x-9=5x+19 | | 5/6-3x=2/5x-199/6 | | 6+7x=-x-82 | | 2/7x-10=x-795/77 | | -3/4x-1/2=-6/7x-5/7 | | 4/7x+9=x+513/56 | | 3x-1=23+7x | | 3x-2=-8/21+4/7x | | 7x-9=-2/5x-307/30 | | 1/3x+2/5=776/15-7x | | 7x-1/3=4x+89/3 | | -1/3x-1=3x-17/27 | | 7+5x=3x-15 | | 5x+2/3=326/3-4x | | 4x-8/9=-388/99-1/6x | | 3/10+3/7x=2/7x-19/70 | | 6-6x=-2/7x+2 | | -1/4+5x=-2x+11/12 | | -5/6+3x=5x+103/6 | | 8+1/2x=6x+28/9 | | 2/5x+3=113/35+2/3x | | 5/6-5x=7x+869/6 |