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x+x+3+x+6+x+9=38cm
4x+18=38/-18
4x=20/:4
x=5
5,8,11,14
A.5cm
B.8cm
C.11cm
D.14cm
obwód= 5cm+8cm+11cm+14cm=13cm+25cm=38cm
nie wiem czy o to ci chodziło, ale tak to zrozumiałam ;D