✨ Best Answer ✨
2a(x-5)-b(2x-10)
=2a(x-5)-2b(x-5)
x-5=Mと置くと
=2aM-2bM
=2M(a-b)
ここで戻して
=2(a-b)(x-5)
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なるほどどど！！！！！！ありがとうございます！！