If it's not what You are looking for type in the equation solver your own equation and let us solve it.
3u-6=21
We move all terms to the left:
3u-6-(21)=0
We add all the numbers together, and all the variables
3u-27=0
We move all terms containing u to the left, all other terms to the right
3u=27
u=27/3
u=9
| 12/9=20y | | 13x+13=180 | | 2x+25=3x+6 | | 5x-42=4x-11 | | 2x-9=7x-44 | | -12n+(4n-4)=6(1+5n) | | H(x)=(-32x^2/3025)+x200 | | 5z+6−4z=−3−10 | | x^2+2x-55=0 | | 2800=1/2*a*144 | | ?x11-43+85=246 | | ?x12-128=246 | | 8+9j=71 | | 3x+8+2x=40+4x-2x | | 12=36+-6g | | 22-4g=6 | | -2t+39=-5 | | 4.2x-17.9=-5.3 | | c/6-41=-38 | | 8(r+38)=96 | | d/5-2=6 | | -16x-12=24 | | 12x18=90 | | 6z+9=99 | | 5^(9n+5)=625 | | w/6+53=59 | | 3(d-87)=21 | | (14+18)+4=316+x+4 | | 8.x=72 | | 12-n=2n-3 | | v+19*9=8 | | 96=4(b+7) |