✨ Best Answer ✨
(a-b)x+(b-a)y
= (a-b)x+(-a+b)y ←-aとbの順番を入れ替える
= (a-b)x-(a-b)y ←マイナスを外に出す
◆a-b=Mと置き換える場合
Mx-My=M(x-y)◆
= (a-b)(x-y)
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