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392 = 2(3x+4 + x+6)
392 = 2(4x +10)
392 = 8x + 20
392-20 = 8x
372 = 8x
372/8 = x
46,5 = X
Panjang = 3X+4
= 3 x 46,5 + 4
= 143,5 cm
Lebar = x + 6
= 46,5 + 6
= 52,5 cm
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392 = 2 ( 3x + 4 + x + 6 )
196 = 4x + 10
4x = 196 - 10
4x = 186
x = 46,5
Panjang :
( 3 × 46,5 + 4 ) cm = 143,5 cm
Lebar :
( 46,5 + 6 ) = 52,5 cm