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7x-[ xg-(3x-2g-5)]+7-10x+9g

Răspuns :

= 7x-(3x²g-2xg²-5xg)+7-10x+9g=

=7x-3x²g+2xg²+5xg+7-10x+9g=

=-3x-
3x²g+2xg²+5xg+7+9g=

= -3x(1+xg) + xg(2g+5) +9g +7