If it's not what You are looking for type in the equation solver your own equation and let us solve it.
16a=84
We move all terms to the left:
16a-(84)=0
We move all terms containing a to the left, all other terms to the right
16a=84
a=84/16
a=5+1/4
| x^2+6x-8=15 | | 4(6x−8)=24x−32 | | 4t2=32t | | 15-16x=-11-100 | | 14-8x=3x=8 | | 3x-12=-2x-32 | | 4+2(p+5)=44 | | 1=r2− 2 | | 0.4(y-1)+0.12y=0.06y-0.7 | | 6(2y-6)-2(3y)=9 | | 6/5r-1=-131/35 | | 8x/6=-12 | | F(3)=4x^2-6 | | -.8+r=12.68 | | 4n-2=-n-12 | | 6x+10=12x | | -(3x+2)=19 | | 2(1-4x)=5(2x+4) | | 6/5r-1=-(131/35) | | 9s+6-8s=-5+8 | | x/6+11=3x6 | | x1/2=15 | | 0.008(6-k)+0.03(k-3)=1 | | 0.15=x-0.45 | | 13d=×0 | | x^2+16x+753=0 | | -.8+r=1 | | 6+5x=5x+10 | | 5/7m−1/7=1/42 | | 9-x+2x=4-4x | | Y=35x+105 | | 6n−12=n+3 |