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If 7a421 - 57acc = 1b7bb find number abc. Multiple solutions may exist.

Max Mason

Died 23 Mar 1961 at age 83 (born 26 Oct 1877).American mathematical physicist, educator, and science administrator. During World War I he invented several devices for submarine detection - several generations of the Navy's "M," or multiple-tube, passive submarine sensors. This apparatus focused sound to ascertain its source. To determine the direction from which the sound came, the operator needed only to seek the maximum output on his earphones by turning a dial. The final device had a range of 3 miles. Mason's special interest and contributions lay in mathematics (differential equations, calculus of variations), physics (electromagnetic theory), invention (acoustical compensators, submarine-detection devices), and the administration of universities and foundations.

When you truly don't care

When you truly don't care when anyone thinks of you, you have reached a dangerously awesome level of freedom.
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