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width = (3/10 * length) + 4

width = 13.

13 = (3/10* L) + 4

9 = 3/10 * L

9 * 10/3 = L

90/3 = L

30 = L

to check substitute L = 30 in the equation.

[3/10 (30) ] + 4 = 13

(90/10) + 4 = 13

9 + 4 = 13

13 = 13 (check)

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