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PQ = RS
3x - 5 = x + 9
2x = 14
x = 7
maka PQ = 3(7)-5 = 16cm
maaf kalau salah
3x - x = 9 + 5
2x = 14
x = 14/2
x = 7
PQ = 3x - 5
= 3(7) - 5
= 16 cm