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Verified answer
P+7 = 3lp = 3l-7
Keliling = 2(p+l)
36 = 2(3l-7+l)
36 = 2(4l-7)
36 = 8l-14
36+14 = 8l
l = 50/8
l = 6,25 cm
P = 3l-7
p = 3(6.25)-7
p = 18.75-7
p = 11.75 cm