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x= p-3
K= 2 ( p + x)
= 2p +2p-6
= 4p-6
4p-6 = 90
4p = 90 +6
p= 96 /4
p= 24
x = p-3
=24- 3
=21
jadi x atau lebar = 21 ,p = 24
semoga bantu yaa