Wyłącz wspólny czynnik przed nawias
4x(a + b) - (a + b)(y+x^)
^ - do kwadratu
4x(a + b) - (a + b)(y+x²) = (a+b) ( 4x – y -x²)
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4x(a + b) - (a + b)(y+x²) = (a+b) ( 4x – y -x²)