If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-8+u=9
We move all terms to the left:
-8+u-(9)=0
We add all the numbers together, and all the variables
u-17=0
We move all terms containing u to the left, all other terms to the right
u=17
| -4v+8=-7v2 | | -5=-9q2 | | 4n-6+3n=7n+2 | | 8y2+3=0 | | 5x+11=126 | | 5n-7-3n=6n+17 | | 5+50+500=5x | | 2x3–13x2+6x=0 | | -t=9{t-10} | | 3w+11=71 | | 3w+11=17 | | 17=3-w/20 | | |x|+2=8 | | 2x2=-3 | | 31/5x=8 | | v/4-9=17 | | 20=10^x | | 7/12x=21/4 | | -9/5-4/3x=-3/2 | | 85=5y+15 | | 8r+7=-6r2 | | 11x+1=9x+2 | | |7x-1|=20 | | 2g-4=9 | | x*0,4=100-x | | 15.3+1h=1.3 | | 7/12x=51/4 | | 5g/3=15 | | -3=4+-1y | | 70=5v+15 | | 3x+1/3x=30 | | 8=2p/5 |