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38 = 2(x+7) + 2(2x-3)
38 = 2x + 14 + 4x - 6
38 = 6x + 8
38 - 8 = 6x
30 = 6x
x = 30/6
x = 5
Jadi lebarnya adalah (2x - 3) cm = (2.5 - 3)
→ 7cm. Lebar = 7cm.