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k in (-oo:+oo)
-4 = k-5 // - k-5
5-k-4 = 0
1-k = 0 // - 1
-k = -1 // * -1
k = 1
k = 1
| t-5=-9 | | -2z+3+7z=-2 | | w+6=10 | | -1+a=-5 | | -9=t+3 | | a+2=-4 | | 4+t=10 | | 4(x+3)+1=-7 | | a+3=6 | | 9=n+9 | | 4m=44 | | -9+k=-6 | | 4=k+5 | | 9x^2-48x-64=0 | | -15=a-9 | | b+3=-1 | | 3=w-9 | | t/4=-5 | | 6=m+2 | | -1=n-8 | | d-7=-1 | | 8+a=-3 | | d+9=18 | | b/-4=-7 | | -3w=0 | | 6=a-1 | | 5+t=14 | | 8+t=12 | | 7+6n+4n= | | 2+k=12 | | 2t=24 | | 14x-20=78 |