If it's not what You are looking for type in the equation solver your own equation and let us solve it.
8x+13x+5=0
We add all the numbers together, and all the variables
21x+5=0
We move all terms containing x to the left, all other terms to the right
21x=-5
x=-5/21
x=-5/21
| -3.09+6.25-9.3b=-8.5b+5.8 | | 8x=16* | | 20x-12x=-8 | | 4.8c-2.1c+4.19=9.3c+1.55 | | 4.8c−2.1c+4.19=9.3c+1.55 | | a+6/8=9/11 | | 86d=688 | | 9.82+7.3n=7.7n+9.82-4.9n | | 4(x-7)=2x+11-x | | 3k-3k+3k-k=16 | | 9-5v+8=-9+8v | | x÷8-9=-3 | | -8y+9y-6=-2y+9 | | (6x+6)/5=((11/5)x-6/5)(2/3) | | 4y+12=3y-9 | | 7/11=15/x+15 | | -9s+3=9-8s | | 2(–6+2q)= | | q/11=1* | | 11k+4k+3k-12k-5k=10 | | -6w+1.83=-8.6w-8.83 | | -4x3.7=-8x-2.1 | | -6h-10+6h=4h+10 | | 6t-14=4t+8 | | -9q-8=6q+8-1 | | 3x+5=-7 | | -4x+6=-25 | | 10+5u=-10+10u | | 8h-h-5h=18 | | 0=7x^2-28 | | 3n+5=-7* | | 6b-6b+2b+5b=7 |