If it's not what You are looking for type in the equation solver your own equation and let us solve it.
4+2a=18
We move all terms to the left:
4+2a-(18)=0
We add all the numbers together, and all the variables
2a-14=0
We move all terms containing a to the left, all other terms to the right
2a=14
a=14/2
a=7
| 31+116+m1=180 | | 5(x-20)=300 | | 2y+9=5y+20 | | 4u+5=-11 | | 49x^2+48=98x | | y/5+12=29 | | 5/x-9=3 | | 87=4x+11 | | 3(2x-15)=1 | | y/9=13/7 | | 6=9x=20+2x | | 17–3v=2 | | 5x+4=31=2x | | 5b3=17 | | x=18015 | | 6.z+28=64 | | 2x+17=65-4x | | 15.b+30=60 | | 2.b+35=53 | | 9x-(3x+7)=7x-38 | | -3(x-4)=12-9x | | 0.05y+y=30 | | 9c-4=5(c+4) | | 35+4y-10=14y-11-4y | | 8(3w+4)/3=0 | | -13x-20=10x/70 | | 8y+14=110 | | x-20=-10x/70 | | 11y+5=115 | | 11y+5=65 | | 2x+4=-7x+15 | | X^2+30x+49=0 |