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OpenStudy (anonymous):
The perimeter of a rectangle is 68 inches. The perimeter equals twice the length of L inches, plus twice the width of 9 inches. 68 = 9L + 2 68 = 2L + 2(9) 68 = 9(L + 2) 68 = L/2 + 2(9) 68 = 2/L + 2/9 68 = 2(L - 9)
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OpenStudy (campbell_st):
Normally for the perimeter of a rectangle P = 2l + 2w you know P and w so 68 = 2L + 2(9)
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