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a*4 drugi bok
420 m= 2( a+4a)
420m= 2a+ 8a
420m= 10a /:10
42= a krótszy bok ma 42 m
42*4=168 dłuższy bok
4x - drugi bok
420 = 2x + 2 * 4x
420 = 2x + 8x
10x = 420 / :10
x = 42