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10 + 5 = 2p + p
15 = 3p
p = 5
b. 2x - 3 ≥ 6x -15
2x - 6x ≥ -15 + 3
- 4x ≥ -12
x ≤ 3 (karena kedua ruas dibagi bilangan negatif maka tanda harus dibalik)