Answer:
11
Explanation:
I assume that 3z + 3 and 4z - 1 represents the length and width of the rectangle.
thus, perimeter of a rectangle :
2 (a + b) = 158
2 ( 3z + 3 + 4z - 1 ) = 158
2 ( 7z + 2 ) = 158
7z + 2 = 79
7z = 77
z = 11
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