use laws of indices 5/7-3=
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Laws of indices
(read as ' squared') means a × a . has been multiplied by itself twice. The index, or power, here is 2.
(read as ' cubed') means a × a × a . has been multiplied by itself three times.
(read as ' to the power of 4') means a × a × a × a . has been multiplied by itself four times, and so on.
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