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a-b=2,2
a=2,2+b
2(2,2+b)+2b=54
4,4+2b+2b=54
4b=49,6
b=12,4cm
a=14,6cm
x + x + x + x = 4x
a = x + 2,2cm
b = x
54cm - 4,4cm = 49,6cm
4x = 49,6cm
x = 49,6 : 4
x = 12,4cm
a = 14,6cm
b = 12,4cm