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d in (-oo:+oo)
-9 = d-6 // - d-6
6-d-9 = 0
-d-3 = 0 // + 3
-d = 3 // * -1
d = -3
d = -3
| -9+m=-6 | | -2+n=-7 | | -8=b-10 | | k-9=-5 | | n-6=-18 | | 3a=-21 | | w+9=18 | | t+3=-5 | | 5+t=-1 | | 2+k=0 | | -7+w=0 | | 2=m-4 | | m/5=7 | | 4=w+9 | | -3=t-3 | | 3t=-18 | | -7+k=-17 | | b-2=-14 | | 6=n+10 | | -5+a=-13 | | 17=k+6 | | 2y^2+24y+36=36 | | 0.5x+7=43 | | 7+b=19 | | -6=w-10 | | 7+d=14 | | 7k=-49 | | 3+b=13 | | t-4=-13 | | 5n=55 | | d-3=8 | | d+4=7 |