If it's not what You are looking for type in the equation solver your own equation and let us solve it.
21x-21x-12=-12
We move all terms to the left:
21x-21x-12-(-12)=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
| 2+4x+16=12x+4+12 | | 7(y-12)=21 | | X-0.20x=1.02x | | -5+5-x+1=-18 | | -9x=38 | | 8n/3n=-17 | | -5x-5-1x+1=-18 | | -3x-9+1x-3=-24 | | 160j=65.600 | | -(5x-3)+5=-52 | | 5x+78-x=180 | | 4(2x-6)=-40 | | 1000(8x-10)=40(1.160+100x) | | 5(x-15=25 | | 9x+20+7x=24 | | 0.8+0.6-0.9x=1.4 | | -5(-5r+4)-5r+5=-50 | | 6x-11-x=9x+53+x | | 2x+10+x=21 | | 100=k(20) | | F(2)=-2x+8 | | f-7=2(7+9) | | 4a^2-9=9 | | -7(n-6)-3(4n-3)=51 | | 8(x-5)=5(7x-8) | | 10x+19=16x | | 37.5=2.5x | | 52=-w/4 | | 2/3t=8/6 | | -4(a-6)-4(4a+8)=52 | | -20=(z/10)-22 | | 11=83-4c |