а) у(4-х)+х(4-х)=(4-х)(у+х)
б) m(n+x+b)-a(n+x+b)=(n+x+b)(m-a)
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а) у(4-х)+х(4-х)=(4-х)(у+х)
б) m(n+x+b)-a(n+x+b)=(n+x+b)(m-a)