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)
40/56 = k/7 // - k/7
40/56-(k/7) = 0
5/7-1/7*k = 0 // - 5/7
-1/7*k = -5/7 // : -1/7
k = -5/7/(-1/7)
k = 5
k = 5
| 99=4x+4x+3 | | 4w/5=10 | | 6/8=7/a | | 30x-20x^2=0 | | 2p(p+5)=9 | | 20/5+4x4-3 | | (P-5)/P=0.333 | | 4x-(5x+7)=8x-34 | | 99=4x+4x+e | | -8x-110=5x+46 | | -3y-4=-8 | | 10d-6=4d-15-3s | | 11x+6=-11y+6 | | 10=4w/5 | | 32-p=3/5p | | -132=7x+7x+8 | | 1/2g-6f+3/4h=10 | | 3x-8x+5=0 | | 36=2(-4x+3)-(6+3x) | | x-3(4-x)=28-x | | 4x^2+2x^2+3=X+2 | | 21/3+31/2+22/5= | | -0.02x^2+0.9x+40=0 | | v+6+v+8=2(7-5v)+4(5v-8) | | x*2+X+3=0 | | p-38=47/5(18-7) | | 3x^3+12x^2-11=0 | | (s+24)(a-27)=0 | | 13x=-12/13 | | 8+u=16 | | 5/16+5/x | | 4-2x=8+2x |