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k in (-oo:+oo)
9 = k+6 // - k+6
9-k-6 = 0
3-k = 0 // - 3
-k = -3 // * -1
k = 3
k = 3
| -10=w-1 | | -6m=-6 | | 0=a-3 | | -7+n=-2 | | 6=w+5 | | 5+t=3 | | m+9=-3 | | (2*12)10+4-6= | | n+6=18 | | b/-7=6 | | 7=x-3 | | 5w=5 | | -5+b=5 | | a+7=8 | | m+5=-1 | | k-3=-5 | | k-5=-9 | | a/3=6 | | d/-6=7 | | 10+w=15 | | d+7=0 | | -9=w+3 | | d+10=5 | | a+2=11 | | w-8=-7 | | m+7=17 | | 3+n=2 | | 5=k-7 | | 6w=-60 | | d/-3=6 | | -21=t-10 | | k+8=18 |