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3(x+5)-(2x-1) la puterea 2 - 13=5(1-x)(1+x)+(x-3) la puterea 2

Răspuns :

3x+15-4x²+4x-1-13=5-5x²+x²-6x+9
-4x²+7x+1=-4x²-6x+14
7x+6x=14-1
13x=13
x=1