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 = -2.5 // + 2.5
(-1/4)*k+2.5 = 0
2.5-1/4*k = 0 // - 2.5
-1/4*k = -2.5 // : -1/4
k = -2.5/(-1/4)
k = 10
k = 10
| -1-10=2y | | 9x^5-61x^4-61x^3+9=0 | | -22-7= | | (10/3)/(-1/6) | | -12=-3/2k | | 18+b=-1 | | 10/3/-1/6 | | -(10/3)b=5 | | 3x+2(y-1)=4(y+2)-(y+5) | | -11+a=-9 | | -5(f+7)=3(f-1) | | 27X/958.74 | | (7/10)m=10 | | (5x-2)+3x-2=5 | | -2-10=2y | | 32x+24y=3200 | | 7/4x=28 | | 9x^2-245x+500=0 | | 5x-3x+8=2x+1 | | 2(2x+10)+2x=68 | | 2f/2-4=-24/4 | | 5p/3-3/3=9 | | 8e^7x+5=3 | | 1/3x+1/2=-2 | | 6x+20=68 | | x/3-1/3=x/2+3 | | 1/x-1/x-5=9/100 | | 2/x*4z/9 | | 8+4= | | 4z/13+3/13=-1 | | 1/x+1/x-5=9/100 | | 2/5-3b/5=8/5 |