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2(2x+5) + 2(5x) = 66
4x + 10 + 10x = 66
14x = 66- 10
14x = 56
x = 4
a. p = 2(4) + 5 = 13 cm
l = 5(4) = 20 cm
b. luas = p×l
= 13 × 20
= 260 cm ²