(x² + 3x) / (x – 4) = (x² – x) / (4 – x)
(x² + 3x) / (x – 4) = (x – x²) / (x – 4)
x² + 3x = x – x², x ≠ 4 (!!!)
2x² + 2x = 0
2x·(x + 1) = 0
x₁ = 0, x₂ = –1
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(x² + 3x) / (x – 4) = (x² – x) / (4 – x)
(x² + 3x) / (x – 4) = (x – x²) / (x – 4)
x² + 3x = x – x², x ≠ 4 (!!!)
2x² + 2x = 0
2x·(x + 1) = 0
x₁ = 0, x₂ = –1