a) m (x+y)-n (x+y) = (x+y) (m-n)
б) -8y × (3x-5c)+3c×(-5c+3x)= -(3x-5c)×(8y-3c)
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a) m (x+y)-n (x+y) = (x+y) (m-n)
б) -8y × (3x-5c)+3c×(-5c+3x)= -(3x-5c)×(8y-3c)