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5x - 6 = 3x + 4
2x = 10
x = 5
pajang diagonal = 5x - 6
= 5(5) - 6
= 25 - 6
= 19 cm
3x + 4
= 3(5) + 4
= 15 + 4
= 19 cm
= 19 cm...............................................................