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1 - (x + 9) < 2x + 8 - 1
-x - 9 < 2x + 7 - 1
-x - 2x < 6 + 9
-3x < 15 x-1
3x < -15
x < -15 / 3
x < -5
x = {-6, -7, -8, -9, -10, ...}
Semoga membantu. Tapi, maaf kalau salah ~
-15 < 3x
-15/3 < x
-5 < x
{X Ι X > -5, x bilangan bulat}