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5x = 3x + 8
5x - 3x = 8
2x = 8
x = 4
panjang diagonal = 5x = 5 x 4 = 20 cm
5x-3x = 8
2x = 8
----- = -----
2 2
x = 4
5x = 3x +8
5(4) = 3(4) + 8
20 = 12 + 8
20 = 20
panjang diagonal persegi panjang tersebut adalah D. 20 cm