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4-7-31
X
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    Start by distributing the 7X. So we get 63 X -7 X to the -3. All that times DX. So we're going to add 1 to the exponent. Divide by the new exponent, so 63 halves X ^2. When we add 1 to the exponent, we get -2 and -7 / -2 is +7 halves X to the -2 plus our arbitrary constancy.