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4 ( 2x + 2 + x + 5 +2x - 4) = 156
4 ( 5x + 3 ) = 156
20x + 12 = 156
20x = 156-12
20x = 144
x = 144/20
x = 7,2
a ) nilai x adalah 7,2
b.) ukuran
panjang = 3x + 2
= 3 (7,2) + 2
= 23,6
lebar = x + 5
= 7,2 + 5
= 12,2
tinggi = 2x -4
= 2(7,2) -4
= 10,4
c.) volum = p x l x t
= 23,6 x 12,2 x 10,4
= 2994, 368cm³