Track / Stage 4 / 42 of 340 #302 of 1964

15. Integers $x, y$ satisfy $(2 x+3)(y-4)=9$, then the maximum value of $x+y$ is

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Official solution

$12$

Source: NuminaMath-1.5, licensed Apache-2.0. Statement and solution reproduced as published; topic, difficulty and ordering added by this site.