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d in (-oo:+oo)
d+4 = 7 // - 7
d-7+4 = 0
d-3 = 0 // + 3
d = 3
d = 3
| -21=k-9 | | a+7=-4 | | -10+m=-11 | | 15=n+10 | | 1+a=3 | | -3b=-30 | | n/-6=7 | | t+6=-2 | | x+5x=28 | | 3+k=1 | | -3=m-9 | | m-2=-9 | | -3+t=-5 | | 20=k+8 | | b+8=19 | | y+12=4/5(x+6) | | -9=d-8 | | -3m=-24 | | 15=d+4 | | 8=k+8 | | 9+w=12 | | -10+n=-6 | | w/6=5 | | 0=k+3 | | d/7=-6 | | 6=d+6 | | t+2=-3 | | b-10=-10 | | 0=b+3 | | t+7=15 | | t-7=-5 | | 17=t+7 |