Răspunsuri

2014-05-27T21:08:35+03:00
(2x-x²-6+3x)-(5x+x²-25-5x)= -2x²+12x -5x+5

5x -x² -6 -x²+25 = -2x² +7x +5

-2x² +5x +25 = -2x² +7x +5

5x+25=7x +5

5x-7x=5-25

-2x=-20

x=10