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PS = QR
PQ = SR
2x+3 = x+9
2x-x = 9-3
x= 6
PQ = 2x+3 = 2.6 + 3 = 12 + 3 = 15 cm
2x-x = 9-3
x = 6
jadi 2x + 3 = 2x6 + 3
= 15cm
maaf jika jawaban kurang memuaskan :)