If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-84=-7a
We move all terms to the left:
-84-(-7a)=0
We get rid of parentheses
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
| -4=1+h | | 12x+18=9×+12 | | 2x+1=5.75 | | 12x+18=9×+22 | | 5/h =5.1 | | 5-5v=60 | | 2+y=5.75. | | 2/x=1/9 | | 26=-5h+1 | | 10=5+m/3 | | -4(-3t+1)+7t=5t-4 | | 9=6+f | | -7=-d/2-3 | | (3x)-5=55 | | -4b+3+8=32 | | X+1/6=2x/3 | | x1/2+1/3=−5/3 | | F(x)=1/x^2-3x-40 | | 2-3y=-8+2y | | 5y+3y=46 | | 7y+8=-9+9y | | 10=7+k | | 3c-2-5c=28 | | x12+13=−53 | | 32 =3r | | 8=s+4 | | 7(x-4)-2=4-5(x+1) | | 6f=-48 | | (7(4w+2))/4=-4 | | 2v-12=22 | | (4.6+x*2)/3=0 | | 14+4u=94 |