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3x > -12
x > -4
2. Rp. 75000
4x + 3 > x - 9
4x - x > -9 - 3
3x > -12
x > -12 : 3
x > -4
HP = { -3 , -2 , -1 , ... }
2.
Harga awal = Harga akhir : ( 100% - diskon% )
= Rp 60.000 : ( 100% - 20% )
= Rp 60.000 : 80%
= Rp 75.000