7x=2,8dm, czyli 28cm
7x=28/:7
x=4
3x=3*4=12
5x=5*4=20
12+20+28=60cm, czyli 6dm
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7x=2,8dm, czyli 28cm
7x=28/:7
x=4
3x=3*4=12
5x=5*4=20
12+20+28=60cm, czyli 6dm