0 x 9 + 8 = 8

9 x 9 + 7 = 88
98 x 9 + 6 = 888
987 x 9 + 5 = 8888
9876 x 9 + 4 = 88888
98765 x 9 + 3 = 888888
987654 x 9 + 2 = 8888888
9876543 x 9 + 1 = 88888888
98765432 x 9 + 0 = 888888888
987654321 x 9 + (-1) = 8888888888
9876543210 x 9 + (-2) = 88888888888

98765432099 x 9 + (-3) = 888888888888

987654320988 x 9 + (-4) = 8888888888888

9876543209877 x 9 + (-5) = 88888888888888

98765432098766 x 9 + (-6) = 888888888888888

987654320987655 x 9 + (-7) = 8888888888888888

9876543209876544 x 9 + (-8) = 88888888888888888

98765432098765433 x 9 + (-9) = 888888888888888888

987654320987654322 x 9 + (-10) = 8888888888888888888

9876543209876543211 x 9 + (-11) = 88888888888888888888

98765432098765432100 x 9 + (-12) = 888888888888888888888