Способ группировки:
(ay+3ax)-(12bx+4by)=a(y+3x)-4b(3x+y)=(y+3x)(a-4b)
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Способ группировки:
(ay+3ax)-(12bx+4by)=a(y+3x)-4b(3x+y)=(y+3x)(a-4b)
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