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3x = 12 + 6
3x = 18
x = 6
Panjang sisi = 4x + 6
= 24 + 6
= 30
7x - 12 = 4x + 6
7x - 4x = 6 + 12
3x = 18
x = 18 : 3
x = 6
maka panjang sisi
4x + 6 = 4(6) + 6 = 24 + 6 = 30 cm