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k in (-oo:+oo)
-7 = k-8 // - k-8
8-k-7 = 0
1-k = 0 // - 1
-k = -1 // * -1
k = 1
k = 1
| w+7=11 | | w/2=-5/6 | | 47/60=x+1/5 | | m+5/8=13/8 | | 6d=-18 | | x=1/8 | | -13/3=m-1/3 | | b+3/5=38/5 | | n/-6=-4/5 | | k/2=4/7 | | k+6=9 | | 1/4+a=-21/44 | | t+5=6 | | 2/5+m=11/40 | | d-2=8 | | -5/9+n=31/9 | | d-3/5=-18/5 | | 5/9=w+5/9 | | n+1/4=9/4 | | -3/8+t=-1/24 | | w/6=-1 | | -45/4=x+3/4 | | b/3=6 | | k+2/5=42/5 | | -88/9=b-10 | | t/2=-2/3 | | m-10=-82/9 | | b/-6=4 | | n+1/7=25/77 | | t+9=-2 | | 8+k=14 | | 2d=4 |