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2(x² + 2x + 1) < 3x² + 6x - 6
2x² + 4x + 2 < 3x² + 6x - 6
-x² - 2x + 8 < 0
(-x - 4)(x - 2) < 0
x = -4 atau x = 2
buat garis bilangan
-----(-4)---------(2)-----
maka didapat HP = {x| -4 < x < 2}