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a in (-oo:+oo)
0 = a+1 // - a+1
0-a-1 = 0
-a-1 = 0
-a-1 = 0 // + 1
-a = 1 // * -1
a = -1
a = -1
| -9+w=3 | | -4d=0 | | a+5=16 | | c+5/(-3)=18 | | -6n=0 | | a+3=13 | | 19=b+9 | | 4p+1=p+7 | | -8x=-7x+7 | | t/-3=6 | | 6t=0 | | w-7=-7 | | w-8=-16 | | -7k=-63 | | n-6=-16 | | 5q+20=7q+4 | | m+3=5 | | 4b=-32 | | 13=w+2 | | b+8=11 | | d+8=19 | | 10(2x+3)=56 | | 3n+7=3+n | | w-6=-7 | | 3w-4=5w+3 | | a-8=-20 | | d+6=4 | | 7+b=18 | | d+2=-2 | | -5+b=3 | | 10f-3=6f+21 | | d-3=5 |