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d in (-oo:+oo)
2 = d+8 // - d+8
2-d-8 = 0
-d-6 = 0 // + 6
-d = 6 // * -1
d = -6
d = -6
| k/3=-5 | | 5x=7y | | 13=t+1 | | -13=w-6 | | t-6=-2 | | m-3=-1 | | -7b=-21 | | 18=d+9 | | 9=k-3 | | 10+x=8 | | 20=t+8 | | 5=x+5 | | b/-3=-2 | | t+9=5 | | 7+b=2 | | -5a=-60 | | -9=w-4 | | -6+k=-7 | | 3=t-5 | | -5=t-6 | | a/2=-7 | | t+9=7 | | 5m=-5 | | 16=b+5 | | -8=a-4 | | 6=d-2 | | -3+n=9 | | t/2=-4 | | 3=b+9 | | d-3=0 | | -9+n=-19 | | d-8=0 |