Substraction (bis)
Solve the equations (adapted from the original @Caek_'s challenge).
aa - a = aaa - a = aaaa - a = aaaaa - a = aaaaa - aa = aaaaaa - aaaaa = aaaaaaa - aa = aaaaaaa - aa = aaaaaaaa - aa = aaaaaaaa - aaaaa = aaaaaaaa - aaaaaa = aaaaaaaaa - aaa = aaaaaaaaaa - aaaaa = aaaaaaaaaa - aaaaaaaa = aaaaaaaaaaa - aaaa = aaaaaaaaaaa - aaaaa = aaaaaaaaaaaaa - aaaaaa = aaaaaaaaaaaaaa - aaa = aaaaaaaaaaaaaaa - aa = aaaaaaaaaaaaaaaa - aaaaaaaa =
aa - a = a aaa - a = aa aaaa - a = aaa aaaaa - a = aaaa aaaaa - aa = aaa aaaaaa - aaaaa = a aaaaaaa - aa = aaaaa aaaaaaa - aa = aaaaa aaaaaaaa - aa = aaaaaa aaaaaaaa - aaaaa = aaa aaaaaaaa - aaaaaa = aa aaaaaaaaa - aaa = aaaaaa aaaaaaaaaa - aaaaa = aaaaa aaaaaaaaaa - aaaaaaaa = aa aaaaaaaaaaa - aaaa = aaaaaaa aaaaaaaaaaa - aaaaa = aaaaaa aaaaaaaaaaaaa - aaaaaa = aaaaaaa aaaaaaaaaaaaaa - aaa = aaaaaaaaaaa aaaaaaaaaaaaaaa - aa = aaaaaaaaaaaaa aaaaaaaaaaaaaaaa - aaaaaaaa = aaaaaaaa