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Answer:
1. if the same quantity is added to both sides of an equation, the resulting equation is equivalent to the original equation. 2. the same quantity is subtracted from both sides, the resulting equation is equivalent to the original. 3. - If both sides of an equation are multiplied by the same (nonzero) quantity, the resulting equation is equivalent to the original equation. 4. If both sides of an equation are divided by the same (nonzero) quantity, the resulting equation is equivalent to the original equation. 5. -a number that makes an algebraic expression true or correct