If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
3*x+6 = x-18 // - x-18
3*x-x+6+18 = 0
2*x+24 = 0 // - 24
2*x = -24 // : 2
x = -24/2
x = -12
x = -12
| 2+d=6d+2 | | -5a-9=3a-41 | | 7t+1=-7t+169 | | 3+3n=4n+10 | | -4+3a=4a+8 | | 7+3w=-7w+27 | | -d-2=34+3d | | 10+d=-6d-4 | | t+2=-22-2t | | 3m+5=95-6m | | 4t-1=5t+2 | | m-6=7m-18 | | 1+2x=3x+12 | | -2t-5=58+7t | | -5w-8=7w-80 | | 6n+4=40+2n | | -6b+6=4b+6 | | -2-3k=5k-2 | | 7k+10=-2k+100 | | 7b+9=33+4b | | 25=4x^2+16t | | 7x+5=5x-15 | | 4m+9=69-6m | | 5m-1=-1+2m | | 4-5m=2m-3 | | 6d+3=d+28 | | -3n+9=-63+6n | | t+7=35-3t | | 2.1p=0.84 | | -a+7=-33+4a | | -4t+3=t+3 | | -7b-4=-b+14 |