2(x+6y)-(x-y)-4-4y
=2x+12y-x+y-4-4y
=(2x-x)+(12y+y-4y)-4
=x+9y-4>
（我上网搜了一下题目,应该是2(x＋6y)－8(x－y)－4－4y,少了个'8'吧）
那么说的话,此题应为：
2(x＋6y)－8(x－y)－4－4y
=2x+12y-8x+8y-4-4y
=(2x-8x)+(12y+8y-4y)-4
=-6x+16y-4
=-2(3x-8y)-4
当3x-8y=2010时,
-2(3x-8y)-4
=-2*2010-4
=-4024