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3x + 2 = 2(x + 2)
3x + 2 = 2x + 4
3x - 2x = 4 - 2
x = 2
panjang diagonal bd
⇔ (3x + 2) cm
⇔ (3×2 + 2) cm
⇔ (6 + 2) cm
⇔ 8 cm