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2X+3=9
2X+3-3=9-3
2X=6
X=3
Maaf kalo salah :)
2
81 = 18 x (2X + 3)
2
2X + 3 = 81
9
2X + 3 = 9
2X = 9 - 3
2X = 6
X = 6 = 3 cm
2