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(3×+2)²≤5²
(3×+2)²-5²≤0
(3×+2+5)(3×+2-5)≤0
(3×+7)(3×-3)≤0
3×+7≤0
3×≤-7
×≤-7/3
atau
3×-3≤0
3×≤3
×≤3/3
×≤1
jadi HP {-7/3,1}