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9x² + 18x + 9 = 144
9x² + 18x - 135 = 0
delta= b² - 4ac
delta= 324+4860
delta= 5184
x₁ = (-b + √delty)/2a
x₁ = (-18 + 72) / 18
x₁=3
x₂ = (-b - √delty)/2a
x₂ = (-18 - 72) / 18
x₂=-5