7×(15+7-4+(x+y×38))^3 when x = 4 and y = 9
7×(15+7-4+(4+9×38))^3
=> 7×(15+7-4+(4+342))^3
=> 7×(15+7-4+346)^3
=> 7×364^3
=> 7×48228544
=> 337599808
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