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64 = 2 (3x+7+2x+5)
64 = 2 (5x+12)
64 = 10x+24
40 = 10x
x = 4
p = 3x+7 = 3 x 4 + 7 = 12 + 7 = 19 cm
l = 2x+5 = 2 x 4 +5 = 8+5 = 13 cm
2 (3x+7 + 2x+5) =64
2 (5x+12) = 64
10x + 24 = 64
10x = 64-24
10x = 40
x = 40/10
x = 4
jadi panjang dan lebarnya adalah
panjang = (3x+7) = 3(4)+7 = 12+7 = 19 cm
lebar = (2x+5) = 2(4)+5 = 8+5 =13 cm