If it's not what You are looking for type in the equation solver your own equation and let us solve it.
k in (-oo:+oo)
13/7 = (6/7)*k+(4/7)*k+3/7 // - (6/7)*k+(4/7)*k+3/7
13/7-((6/7)*k)-((4/7)*k)-(3/7) = 0
(-6/7)*k+(-4/7)*k+13/7-3/7 = 0
10/7-10/7*k = 0 // - 10/7
-10/7*k = -10/7 // : -10/7
k = -10/7/(-10/7)
k = 1
k = 1
| 54/5=4x+1/5x-6 | | -3/5x-5/8+1/6x=89/24 | | 7n+4/5+2n=-536/5 | | 11/2=-6a+a+10 | | -d+8+5d=28/3 | | -1/2-a+a=-1/2 | | -16/3=-1/3a+a-2 | | 2+2b-7b=32 | | -w+2/5-2/5w=-47/5 | | 3x^2-3-36=0 | | y=-3(-3)+4 | | y^2+6y=-2 | | -563/84=-x+2/7x-7 | | 5+d-2d=-1 | | 5/8+5d+4d=77/8 | | 5/7+1/6d+1/2d=61/7 | | 6+7m-m=24/5 | | -3x+-3=-36 | | -5/6t-5/7+t=-38/63 | | 6+5t-7t=25/6 | | 0.9(-0.7+9x)=8.4x | | 6-2/3k+6k=194/3 | | 1/2w+4-2w=49/10 | | 52=5t-4/5t+10 | | 29/3=2b+5b+5 | | -t+6/7+2t=32/21 | | 1/4t+9/10+3/4t=103/70 | | 1/3+2/5m-m=19/30 | | 72/5=5x+2x+2/5 | | 2/5b+7+7b=442/5 | | -12/5=-x+2x-3 | | 3x-5=10x |