Fill in the blank with an appropriate word, phrase, or symbol. With the negative exponent rule, for x#0, the expression x -7 can be simplified to With the negative exponent rule, for x+0, the expression x -7 can be simplified to (Simplify your answer. Use positive exponents only.)

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Q: what is mathematics?

A: Mathematics is a branch of science that deals with the numbers, shapes, quantities, logic etc.