190 * 730 - 73 * 900 = 190 * 73 * 10 - 73 * 900 =
= 73 * 1900 - 73 * 900 = 73 * (1900 - 900) = 73 * 1000 = 73000
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190 * 730 - 73 * 900 = 190 * 73 * 10 - 73 * 900 =
= 73 * 1900 - 73 * 900 = 73 * (1900 - 900) = 73 * 1000 = 73000