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8 = 5x - 3x
8 = 2x
x = 8/2 = 4
Pdiagonal = 5x
= 5 x 4 = 20
5x = 3x + 8
5x - 3x = 8
2x = 8
x = 8/2
x = 4
tinggal dimasukkan x nya
pj = 5 × 4 = 20 cm
jadi panjang diagonal persegi panjang tersebut 20 cm