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2p + 30 = 54
2p = 54 - 30
2p = 24
p = 12
umur ratna = 12 tahun
umur ibunya = p + 30
= 12 + 30
= 42 tahun
No. 2
x + 15 + 35 = 125 - 25 (bentuk persamaan)
x + 50 = 100
x = 100 - 50
x = 50 halaman
No. 3
54 - y + 12 = 36 (bentuk persamaan)
66 - y = 36
-y = 36 - 66
-y = -30
y = 30 orang yang turun