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72 = 2(2x+6) + 2(3x-5)
72 = 4x + 12 + 6x - 10
72 = 4x + 6x + 12 - 10
72 = 10x + 2
10x = 72 - 2
10x = 70
x = 70 : 10
x = 7
semogamembantu
P = 2x + 6
= 2 × 7 + 6
= 20
Lebar = 3x - 5
= 3 × 7 - 5
= 16