x² + 6xy + 9y² + x + 3y = 2
(x+3y)² + x + 3y = 2
x+3y = 2 - (x+3y)²
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x² + 6xy + 9y² + x + 3y = 2
(x+3y)² + x + 3y = 2
x+3y = 2 - (x+3y)²