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60 = 4 (2x-3)
60 = 8x - 12
8x = 60+12
8x = 72
x = 72 : 8 = 9
S= 2x-3 = 2.9 - 3 = 18-3 = 15
L = S x S = 15 x 15 = 225 cm²
k = 4 x s
k = 4 x (2x - 3)
60 = 8x - 12
60 + 12 = 8x
72 = 8x
x = 9
L = s x s
= 9 x 9
= 81