If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
(1/4)*(20-(4*a)) = 6-8 // - 6-8
(1/4)*(20-(4*a))-6+8 = 0
(1/4)*(20-4*a)-6+8 = 0
1/4*(20-4*a)-6+8 = 0
1/4*(20-4*a)-6+8 = 0
8-a-1 = 0
7-a = 0
7-a = 0
7-a = 0 // - 7
-a = -7 // * -1
a = 7
a = 7
| 9x/9=72 | | 4p+3q=4.50 | | 6=-2/7z | | (x^2+9x+20)/(x+4) | | 30(5)+30=y | | (3b^7+2b^6+36b^5)/9b | | (3b^7+2b^6+36b^5)/9x | | (3b^7+2b^6+36b^5)/96 | | 30x=25x+25 | | (12v^3+18v^2+3v)/6v | | ln(x+4)-ln(x-2)=6 | | -4+3=y | | -2x-1=-x+3 | | 5x+17=-33 | | (2x)+(x+35)+x=775 | | -2(1)+1=y | | 1-2=y | | n^2+8n-15=0 | | x-2=-2x+1 | | f(x)=-2x^2+2x-3 | | (9+8i)(9+3i)= | | (1/2x+1)=24 | | 1/2*15+1=5 | | 49x^2+4=0 | | x-3=30/5 | | 3x=(1/2)x^2+2x | | 8+8+x=24 | | n-19=35 | | X+5+2x-9=260 | | -4+9=12x-5-11x | | -1/3(x-8)=-1 | | 5y-7y=-6-8 |