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21 k² + 35k =
4 x y – 4 x² =
12 x y – 4 x² =
11 k² + 22 =
3 x y – 12x² =
4 c² + 12 =
22 x y – 4 x² =
5 x² + 15 =
2 x y – x² =
4 c² + 12 =