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-5<=3x+2<=5
-5-2<=3x<=5-2
-7/3<=x<=1
9x^2 +12x + 4 <= 25
9x^2 + 12x - 21 <=0
3x^2 + 4x - 7 <=0
(3x + 7) (x-1) <= 0
-7/3 <= x <= 1