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)
(1/8)*a+4 = 12 // - 12
(1/8)*a-12+4 = 0
1/8*a-8 = 0 // + 8
1/8*a = 8 // : 1/8
a = 8/1/8
a = 64
a = 64
| 1/4x=-9 | | -9t-3(4-t)=42 | | 53/5+3 | | 5(3x+9)=10x+15 | | 8/3x+1/3x=10+7/3x | | 6x+8y=-26 | | 36X4/9 | | 2/3(x-6)-1/4x=3/8(8-x)+1/2x | | 8x-4x+120=8x+64 | | 13p-14+64p= | | 9x+1+8x+9=180 | | 3/5(x+2)=y | | (5x-3)^6/(5x-3)^4 | | -3.7x-1=8.2x-5 | | 5(2x+5)-(4x-1)=44 | | 2/5(x-10)=2x-4 | | 8x-4+120=8x+64 | | 8x-20+y=90 | | y=3bx-7x | | 8x-20+x=90 | | 10-5g=0 | | 2/x-1/8x=15/16 | | 8xp=c | | 3x-4+5x+6=90 | | 7.2x+3=6.2x | | 4+9n+5n^2=0 | | 27/m=10/3 | | 5x^2=6+2 | | T/17=16 | | (t-4)-5=0 | | y+(2y-1)=2 | | 3x-4+5x+6=190 |