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d in (-oo:+oo)
-1 = d-8 // - d-8
8-d-1 = 0
7-d = 0 // - 7
-d = -7 // * -1
d = 7
d = 7
| w-4=-4 | | a/-7=-3 | | m+7=-4 | | 5+k=12 | | t/4=-2 | | w-10=-19 | | 7=k-2 | | -4=a-2 | | 1+w=7 | | n/5=-2 | | a/-6=-5 | | -8+w=-8 | | 7+a=10 | | m+3=-5 | | b/-4=6 | | 4=n+7 | | m+1=9 | | b/7=-1 | | d+10=9 | | n+4=-1 | | -7t=63 | | d+8=16 | | d+3=6 | | t/7=-1 | | -3b=-3 | | d-9=-10 | | 10+d=16 | | b+10=18 | | 4=k-7 | | 2=b-8 | | -7+t=-9 | | w+8=19 |