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)
(1/4)*k = 3 // - 3
(1/4)*k-3 = 0
1/4*k-3 = 0 // + 3
1/4*k = 3 // : 1/4
k = 3/1/4
k = 12
k = 12
| (2x^4-18)^1/2 | | 3x-6(-4x-8)=264 | | 4x^2-6x=3x^2+x-10 | | 1x-4y=12 | | -g-24=-7 | | 2a+1.2=1.8 | | 13x-3y=78 | | 1x+4y=-12 | | 4(7x+5)=28x-9 | | y/12=(-6) | | 8x=54-7x | | -15-17=13 | | 3m+13-7m=37 | | 9x^2+30x+29=0 | | 3x^2+5-7=0 | | (5-3X)(X+1)(X+6)=0 | | x(x+25)(2x-5)=180 | | y^2-4y+8x-32=0 | | 3(x-6)=9x+15 | | 18.2/j=4/16 | | 6c+3=8c+11 | | 36+n=144 | | 10=5y-2w | | 3(5x+8)=3(5x+6) | | lny-lnx=3.5 | | (6r+7)+(13+7r)=1 | | (y^2+2xy)dx-(x^2)dy=0 | | 5/8-c=12 | | 6n+n=144 | | 15x^2-4x-12=0 | | 3y=15+x | | 2/5r-15=7 |