Working modulo 9 or 11, find the missing digits in the calculations below:
(a) 51840 · 273581 = 1418243x 040.
(b) 2x 99561 = [3(523 + x)]2.
(c) 2784x = x · 5569.
(d) 512 · 1x 53125 = 1000000000.
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