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a in (-oo:+oo)
3 = a-4 // - a-4
3-a+4 = 0
7-a = 0 // - 7
-a = -7 // * -1
a = 7
a = 7
| -6+w=-6 | | k+8=16 | | -6b=-24 | | d-1=0 | | 16=k+4 | | m-1=5 | | n+6=17 | | t/-2=-3 | | b-6=-13 | | 3+b=3 | | n+1=5 | | -7+w=-14 | | b-10=-11 | | w-5=-16 | | 2+m=5 | | 0=d-7 | | w-8=-8 | | m-9=0 | | -17=t-10 | | 20=b+9 | | 2n=22 | | 5=b+9 | | -7m=-70 | | k-9=-1 | | m+10=19 | | -0.4(x+3)=47 | | -12=k-3 | | 10+m=7 | | 0=t-5 | | 19=n+7 | | 3+k=-3 | | -3w=30 |