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2014-10-03T16:13:45+03:00
2X-4=10·3X
30X-2X=4
28X=4
X=28:4
X=7


2x la puterea a 2=x(2x+1)-25
2X²=2X²+X-25
2X²-2X²=X-25
0=X-25
X=25


2 5 2