come si fa 188888 x 143 ?

8 8 8 8 8 1 3 4 1 x = 4 2 6 2 6 2 6 2 6 2 5 2 3 5 3 5 3 5 3 5 3 7 8 8 8 8 8 1 1 1 1 1 1 4 8 9 0 1 0 7 2
x