Zapisz w jak najprostszej postaci obwody narysowanych trapezów.
x+7+x+7+7-y+2y+x-1=
x+7+x+7+7-y+2y+x-1=3x+y+20
x+7+x+7+7-y+2y+x-1= 3x + y + 20
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x+7+x+7+7-y+2y+x-1=3x+y+20
x+7+x+7+7-y+2y+x-1= 3x + y + 20