Explanation:
the perimeter of a rectangle is
2×length + 2×width
for our rectangle here that means
2×(5x) + 2×(x - 3) = 42
10x + 2x - 6 = 42
12x - 6 = 42
12x = 48
x = 4
length = 5x = 5×4 = 20 in.
width = x - 3 = 4 - 3 = 1 in.
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