http://imageshack.us/photo/my-images/5/matematykas1.jpg/
zad 20 i 24
http://imageshack.us/photo/my-images/98/matematykas2.jpg/
ja blagaam1! blagaam!!blagam! wiencej pkt nie mam :(
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20.
250 - 6.75x = 260 - 8.5x + 11
250 - 271 = -1.75x
-21= -1.75x /:(-1.75)
x=12