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4x+6+2x+16=64
6x+22=64
6x=42
x=7
Lebar=x+8
7+8=15
Kalo gak salah gitu
lebar. x+8
karena keliling itu 2 kali panjang+ lebar. maka diperoleh hasil
2(2x+3+x+8) = 64
4x+6+2x+16 = 64
(4x+2x)+(6+16) = 64
6x+22 =64
6x+22-22=64-22
6x=42
x= 42:6
x= 7.
lebar
= x+8
= 7+8
= 15 cm.