9x+7y-9x[4x+5y]-5+7[+x-2]2x+3x=

9x+7y-36x²-45xy-5+7+4x²-4x+3x= =8x+7y-32x²-45xy-5+7

9x+7y-36xdo kwadratu-45xy-5+7+4x do kwadratu-4x+3x=8x+7y-32x do kwadratu-45xy+2

9x+7y-9x[4x+5y]-5+7+[x-2]2x+3x=9x+7y-36x²-45xy-5+7+2x²-4x+3x= 8x+7-34x²-45xy+2 ²