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54 = 4(2x + 3) x 1/2
54 = 2(2x + 3)
54 = 4x + 6
54 - 6 = 4x
48 = 4x
48 : 4 = x
12 = x
4a=108 cm²
a=27 cm
2x+3=27 cm
2x=24 cm
x=12 cm