If 37 – 35 = (2x)(3y), where x and y are integers, what is x + y?

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If 3<sup>7</sup> – 3<sup>5</sup> = (2<sup><em>x</em></sup>)(3<sup><em>y</em></sup>), where <em>x</em> and <em>y</em> are integers, what is <em>x</em> + <em>y</em>?