(3xy+10y)+[5x-(2xy+2y-3x)]
=3xy+10y+5x-2xy-2y+3x
=3xy-2xy+10y-2y+5x+3x
=(3xy-2xy)+(10y-2y)+(5x+3x)
=xy+8y+8x
=xy+8*(x+y)
=-2+8*3
=-2+24
=22
(3xy+10y)+[5x-(2xy+2y-3x)]
=3xy+10y+5x-2xy-2y+3x
=3xy-2xy+10y-2y+5x+3x
=(3xy-2xy)+(10y-2y)+(5x+3x)
=xy+8y+8x
=xy+8*(x+y)
=-2+8*3
=-2+24
=22