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60=2((x+6)+x)
60=2x+12+2x
60-12=4x
48=4x
x=48/4
x=12
rumus p
=x+6
=12+6
p=18
l=12
dit luas persegi panjang
L=p×l
L=12×18
L=216
semoga bermanfaat
:)