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x/2 + 5 = 9
x/2 + 5 - 5 = 9 - 5 (kedua ruas sama-sama kurangkan 5)
x/2 = 4
2 . x/2 =2.4 (agar x/2 menjadi 1x maka dikalikan dengan 2)
x = 8
Menggunakan sifat ax+b ≥ c,berarti ax+b≥-c atau ax+b≤ c
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HP=[ x≥-28 atau x≤8]