\({{{x^3} + 5} \over {x - 7}}.{{x - 7} \over {{x^3} + 5}} = {{\left( {{x^3} + 5} \right).\left( {x - 7} \right)} \over {\left( {x - 7} \right).\left( {{x^3} + 5} \right)}} = 1\)
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