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Answer:
length = 4
Step-by-step explanation:
A rhombus has four equal sides so the perimeter equals 4 sides.
Let x = length of a side
Perimeter of the rhombus is 7 times the length of the side decreased by 12
4x = 7x - 12
-4x = -4x
0 = 3x - 12
+12 = +12
12 = 3x
12/3 = 3/3x
4 = x