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keliling = 2p+ 2l = 2(5x-4) +2(x+3)
70 =10x-8+2x+6
70+8-6=10x+2x
72=12x
x=6
p=5x6-4=26
l=6+3=9
luas = p x l= 26 x 9 = 234 m2