If it's not what You are looking for type in the equation solver your own equation and let us solve it.
13s-2s-5s=12
We move all terms to the left:
13s-2s-5s-(12)=0
We add all the numbers together, and all the variables
6s-12=0
We move all terms containing s to the left, all other terms to the right
6s=12
s=12/6
s=2
| X+11+7=2×+18x=-18 | | 2r+3r-4r-r+r=2 | | 15x-7=-4+2x-13 | | d-8.4=8.6;15.16.17 | | 63+(6x-3)=90 | | 3(2x+5)=-15+6 | | 8h-5=1-2h | | 9p=22 | | 6d-2d-2d-d=6 | | Yx2=-14 | | 16x-9=15x-13 | | -6+|2x-4|=-3 | | q+q+q+2q-q=20 | | 16x−9=15x−13 | | 9p/2=2 | | 16m-13m+m=12 | | 1/2(2x+6)+7=20 | | 16x−9=15x−1316x-9=15x-13 | | 5a-4a+5a=18 | | b-9.7=13.3;23.24.25 | | 2x+2x+x=35 | | 7m+8=4 | | X+2x-21/2=x | | 34=13-x | | 5t-2t=6 | | -5x+7=6x+36 | | 11m+-6m-8m+19m-20m=12 | | r/8=5=4 | | 2x+5x-6x=3 | | 18z-8z+3z+-11z=-10 | | 1/2(8n+6)=4n+3 | | P=25x-(10x+250)) |