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l=x
p=×+18
lalu 2(x+18+x)=76
2(2x+18)=76
4x+36=76
4x=76-36
4x=40
x=40/4
x=10
lebar (x)=10
panjang(x+18)=10+18=28
jadi luas prsegi panjang =p×l=28×10=280
maaf klo slh