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64 = 2(3x+7) + 2(2x+5)
64 = 6x+14 + 4x + 10
64 = 10x +24
64-24 = 10x
40 = 10x
x = 40/10
x = 4
Panjang= 3(4)+7 = 12+7 = 19cm
Lebar = 2(4) +5 = 8+5 = 13 cm