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2x + 2( x+1)= 14
2x + 2x + 2 = 14
4x = 12
x= 3 -> a
3+1= 4 -> b
z tw pitagorasa:
3 do kwadrwatu + 4 do kwadratu = c2
9 + 16 = c2
25 = c2
c= 5 -> przekatna prostokata