\(x\left(x-1\right)-\left(x+1\right)^2=4\)
<=> \(x^2-x-x^2-2x-1-4=0\)
<=> \(-3x=5\)
<=> \(x=-\frac{5}{3}\)
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giup to 3 bai nay
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giup to 2 bai nay
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