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x^{2} +16- 8x +3x ≥ x^{2}+2x-4-2x /-x^{2}-16
-5x≥-20 / :(-5)
x≤4
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x^{2} +16- 8x +3x ≥ x^{2}+2x-4-2x /-x^{2}-16
-5x≥-20 / :(-5)
x≤4