zaoisz podane wyrażenie w postaci jak najprostszej sumy
2(x-3x+4y)-9(4x+4y-x)
2[x-3x+4y]-9[4x+4y-x]=2x-6x+8y-36x-36y+9x= -31x-28y
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2[x-3x+4y]-9[4x+4y-x]=2x-6x+8y-36x-36y+9x= -31x-28y