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(5-2x)(7x-2)+7x(2-7x)-(7x-2) la puterea a doua

Răspuns :

(5-2x)(7x-2)-7x(7x-2)-(7x-2)=(7x-2)(5x-2-7x-1)=(7x-2)(-2x-3)=-(7x-2)(2x+3)