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Wykonaj redukcję wyrazów .
-9x + 8y + 4x - 6y =
2r - 7z + 3-5r -2 + z =
-4k *3* (-5)
-7 *0,3x *(-1)
-2z : (-3)

Tam gdzie są te gwiazdki to jest razy .
daję 20 pkt
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