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130 =2(p+30)
130=2p+60
130-60=2p
70=2p
70/2=p
35=p
luas=pxl
=35×30
=1,050
c. k=2(p+l)
84=2(p+12)
84=2p+24
84-24=2p
60=2p
60/2=p
30=p
luas =p×l
=30×12
=360