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)
(3/5)*k = 21 // - 21
(3/5)*k-21 = 0
3/5*k-21 = 0 // + 21
3/5*k = 21 // : 3/5
k = 21/3/5
k = 35
k = 35
| 9(3y-5)=8(y+11) | | 158=5(6+2m)+6m | | X+(120+X)=160 | | 2x-5+3x=14 | | 6x^2-25x+75=0 | | y=25+0.05x | | 2x+46=53 | | -28+2x+x=20 | | 14x-70x+84= | | 7/q=8/9 | | 160=G+(120+g) | | 1/2y-3=6 | | 3*5x-7=3 | | 21-(4)=x | | x^2-5x+14= | | 14x-6(25-x)=4-(11x-1) | | 6x+2=10+4x-8 | | x^6-x^5-2x^3-4x^2=0 | | p^2+12p-16=-3 | | 5x-76-x=24 | | 28-(3)=x | | 4x-11=2x+13 | | 4(2n)=7n-1/9 | | 4/9s=1/6 | | 7x+59=3x+81 | | 2(y-7)-3=-5(-5y+7)-7y | | 6logex=1 | | solvex^2+2x+y^2+18y=62 | | 7x-4x-36=12 | | 5/5x=50 | | .000016=2x^2+.3x | | 1x+6=7x-12 |