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114 = 2p + 2l
114 = 2(l+7) + 2l
114 = 2l + 14 + 2l
114 = 4l + 14
114 - 14 = 4l
4l = 100
l = 25
l=25
p = l +7
p= 25+7 = 32
luas = p x l
32 x 25 = 800cm^2