If it's not what You are looking for type in the equation solver your own equation and let us solve it.
18+9a=3a+42
We move all terms to the left:
18+9a-(3a+42)=0
We get rid of parentheses
9a-3a-42+18=0
We add all the numbers together, and all the variables
6a-24=0
We move all terms containing a to the left, all other terms to the right
6a=24
a=24/6
a=4
| 300h=9,900 | | 68o=748 | | 3*(8-k)=-3k+24 | | 5x-5x-7=33 | | -3p-2=25 | | x³+x²-21x-45=0 | | 26=2v+2(v+7) | | 7x-2=8-X | | x−56=512 | | 0.6x=7.8 | | 9x/2=18/26 | | 4x-1=7(x-3) | | 24=k*10 | | -44-11w=-11 | | 5z-8=12 | | 24=k10 | | -1-5x=0 | | 164-w=123 | | 176=-x+46 | | 6+-c=10 | | (125/27)^(x+3)=(9/25)^x | | 6+-c=20 | | 36-u=274 | | 49r^2-7r=30 | | 4-5x=202 | | 2x=8(0.5) | | 6x-7=-2x+11 | | 9y+48=17y | | x+78=28 | | 5x+25=x+13 | | 11^x=73 | | 7x/7=-63/7 |