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5x = 3x + 8
2x = 8
x = 4
jika diagonal 1 = 5x maka = 20 cm
diagonal 2 = diagonal 1
diagonal 2 = 20 cm
5x = 3x + 8
2x = 8
x = 8 : 2
x = 4
5x cm = 5 × 4 = 20 cm
( 3x + 8 ) cm = ( 3 × 4 + 8 ) cm = 20 cm