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11.1 + 1 + x² = 8 + x
12.1 + x² = 8 + x
4.1 + x² = x
41/10 + x² = x
(41 + 10x²)/10 = x
41 + 10x² = 10x
10x² - 10x + 41 = 0
10 + √- 1,540
x₁ = --------------------
20
10 - √- 1,540
x₂ = --------------------
20