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68 = 2(2x+7) + 2(4x-9)
68 = 4x + 14 + 8x -18
68 = 12x - 4
68+4 = 12x
72 = 12x
x = 72:12
= 6
panjang = (2x+7) = 2 x 6 + 7 = 19
lebar = (4x-9) = 4 x 6 - 9 = 15
L = p x l
= 19 x 15
= 285
2(2x+7+4x-9)=68 Lebar = 4x-9 = 4(6)-9 = 24-9 = 15cm
2(2x+4x+7-9)=68
2(6x-2)=68 Luas = p x l
12x-4=68 = 19 x 15 = 285cm²
12x=68+4
x=72/12=6cm