(7m-8n)(x+y)-(3m-2n)(x+y)

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(7m-8n)(x+y)-(3m-2n)(x+y)

答:=(7m-8n-3m+2n)(x+y)
=(4m-6n)(x+y)

=(7m-8n-3m+2n)(x+y)
=(5m-6n)(x+y)