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[x + 5 - (x+7)][x + 5 + (x+7)] ≤ 0
[x + 5 - x - 7)][x + 5 + x + 7)] ≤ 0
[-2][2x + 12] ≤ 0
2x + 12 ≤ 0
2x ≤ -12
x ≤ -6