\(\eqalign{& {{3{x^2}} \over {x + 5}}.{{{x^2} - 25} \over {6{x^3}}} = {{3{x^2}.\left( {{x^2} - 25} \right)} \over {\left( {x + 5} \right).6{x^3}}} \cr & = {{3{x^2}\left( {x + 5} \right)\left( {x - 5} \right)} \over {\left( {x + 5} \right).6{x^3}}} = {{x - 5} \over {2x}} \cr} \)
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