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4(x+3) + 4(x) + 4(5) = 88
4x + 12 + 4x + 20 = 88
8x + 32 = 88
8x = 56
x = 7
Panjang = 7 + 3 =10 cm
Lebar = 7
Tinggi = 5
==========
Volume = PLT
= (10)(7)(5)
= 350 cm³