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Find the value of

$\frac { { \left( { 3 }^{ 2017 } \right) }^{ 2 }-{ \left( { 3 }^{ 2015 } \right) }^{ 2 } }{ { \left( { 3 }^{ 2018 } \right) }^{ 2 }-{ \left( { 3 }^{ 2016 } \right) }^{ 2 } }.$

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