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14x=56
x=56:14
x=4
AC=2X=2×4=8CM
CD=5X=5×4=20CM
DB=7X=7×4=28CM
spr. 8+20+28=56cm
56/14=4
AC=2x4=8
CD=5x4=20
DB=8x4=32
x=4
AC+CD+DB=2x+5x+7x
AC=8
CD=20
DB=28