If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
5*x+5*x+2 = -18 // + 18
5*x+5*x+2+18 = 0
10*x+20 = 0 // - 20
10*x = -20 // : 10
x = -20/10
x = -2
x = -2
| 2=5t+4t+2 | | -4=4k+3k+10 | | 7d+1-4d=28 | | 5b-9+7b=-129 | | 7x+9+6x=-82 | | -9=3a-4a-3 | | -72=-7a-a+8 | | 4+6t+7t=-100 | | -10+3w-6w=20 | | 2=-a+4a+5 | | 6-6b+4b=28 | | 4+k+7k=4 | | 39=-k-3k+3 | | -k+1-7k=-7 | | -34=-3x-5x+6 | | 7+5m-3m=1 | | 6b+1+6b=49 | | -7k+10-7k=38 | | 10-4b+2b=0 | | 6d-4+2d=92 | | -6m+3-m=-46 | | -7+2t+4t=65 | | -10=-4m+3m-8 | | -2=5x-6x+8 | | 2d+5+d=32 | | 79=3b+4b+2 | | 3m+3-4m=-6 | | 7b+7-6b=9 | | 7=-5a+6a+4 | | 28=-4a+7a+1 | | 6-4k+k=6 | | 3/5/3/40 |