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Thank you. I get what he did. My question is more specific. Is there a defined "rule of elimination" that applies here and is this process an "allowed" rule or a "must" rule. Must you change the sign...

An engineer worked for 6 days and his assistant worked for 7 days earning a combined salary of $4500.00. The next week the engineer worked 5 days and his assistant worked 3 days for a combined salary...