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)
(1/3)*k-((2/5)*k)+1/5 = 4/25 // - 4/25
(1/3)*k-((2/5)*k)+1/5-(4/25) = 0
(-2/5)*k+(1/3)*k+1/5-4/25 = 0
1/25-1/15*k = 0 // - 1/25
-1/15*k = -1/25 // : -1/15
k = -1/25/(-1/15)
k = 3/5
k = 3/5
| -6/7d+6-1/7d=11/2 | | b+5/6-2b=1/6 | | -1/3w-10-1/5w=-782/75 | | 1+5x-3x=15 | | 69/28=-2a+5a+3/4 | | 9(-8)+3=15 | | 5k+1/2+2k=83/12 | | 3/10+2/3k-5k=-421/330 | | 94/3=6w+2/3w-2 | | -86/7=-5/7k+4k-9 | | -1/2x+9+7x=23/4 | | -3/5a+10-1/2a=6/5 | | 9-6x-x=32/9 | | x+2(+4)=23 | | 68/323 | | d-1/2+2d=-13/5 | | 249/110=3t-1/2t+9/10 | | 9/10-3t+3/4t=-261/10 | | -8=d+1/4d-3 | | 2/9+3/7n+2/7n=419/63 | | -3/4m-9-m=-47/6 | | 2w+3=2w+6 | | -33/5=-4/5n+1/3n-8 | | 1/2a+10+2/7a=431/42 | | -49/5=5w-6w+1/5 | | 21/11=-b-1/3b+3 | | 3n-9+4n=-93 | | 10/9=-4d+3d+1/9 | | 1/2-7n-7n=-335/2 | | 5(x-6)+3x=4(2x+5)-8 | | -5t-7/8+3t=-95/72 | | -6t+9+7t=20 |