2x² + y² - 4x - 5 = 0
2x • x + y² - 4x - 5 = 0
2x - 4x • x + y² - 5 = 0
-2x • x + y² - 5 = 0
-2x² + y² - 5 = 0
-2x² + y² = 0 + 5
-2x² + y² = 5
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2x² + y² - 4x - 5 = 0
2x • x + y² - 4x - 5 = 0
2x - 4x • x + y² - 5 = 0
-2x • x + y² - 5 = 0
-2x² + y² - 5 = 0
-2x² + y² = 0 + 5
-2x² + y² = 5