If it's not what You are looking for type in the equation solver your own equation and let us solve it.
7a=84=
We move all terms to the left:
7a-(84)=0
We move all terms containing a to the left, all other terms to the right
7a=84
a=84/7
a=12
| 5x+4x+11=2(x+23) | | 4(3x-6)=2(6-x) | | 5x+6x+5+3x=2x+29 | | -(x+8)=10 | | 7k-42+8=-13 | | 3(x+2)+3x=12 | | 9x+3-12x+5=7x-2x+12 | | x^2+64=x^2+8x+16 | | 27x=22/15 | | 3x+2+55=13x-2 | | 4(x+2)=3x+12+11 | | -1/3x+2=6+2.25 | | -6t-12+11=-7 | | -1/3x+2=x=6+2.25 | | 9z^2−81=0 | | |x+1|+|x-2|+|x+3|=6 | | 3(73x+43)−2x+8=5x+12 | | 4z+3z+6=34 | | -7(3d-6)=-22+8d | | 7/9=x/20 | | 4/5+3/x=1/2 | | 2n-8+3n=37 | | -11+x+-48=25 | | 5/8r+23=-29 | | 2x+90+3x=10 | | 17a-22=26 | | 10c–8=7c+1 | | 1+z=-2 | | 5(4h-1)-2(2h-3)=-23 | | 21-12c=-25 | | 25+x/29=5 | | 126=9a |