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4,5x = 54
x = 54/4,5
x = 12
jadi, truk yg dibutuhkan adalah 12.
bisa lewat perbandingan misal 3/x = 4,5/18
18X3 = 4,5 x (kali silang)
54/4,5 = x. nah, x itu brp? 54/4,5 = 12