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)
a/8-12 = 4 // - 4
a/8-12-4 = 0
1/8*a-16 = 0 // + 16
1/8*a = 16 // : 1/8
a = 16/1/8
a = 128
a = 128
| -13=7x+2x+5 | | 9n^2-16= | | 125-4x=41x+20 | | u/5=12.5 | | k=1.5(7+k) | | 282=103-x | | 6x^2+12=17x | | 2.56=2v | | 5x+5+4x=-4 | | -5=-6+v | | -4*2+(-2)*4= | | x+9-5=x+4 | | 11=w-7 | | sqrtx+9-5=x+4 | | 5(w-1)=4w+6-5(-3w-1) | | -3=-6x+3x-9 | | 5x-29=19+3x | | 6x^2+12x=17x | | 7x+14-2x=-8 | | 5x-29=10+3x | | 9x-8=4x+6 | | -16-x=-3x+10 | | 7x-50=3x+38 | | 1/6/x=5/9/1/2 | | x=13+5y | | 8/2+2i | | (x+3/5x)/(3x-3/5x^2) | | 3.5/20=10.5/x | | x/20=14/56 | | 4+x-10=14 | | x-16=17+13 | | 31+1x=46 |