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x minus 3 supra 2 x + 1 egal cu x + 5 supra 2 x - 7

Răspuns :

(x-3)*(2x-7)= (2x+1)*(x+5)
2x^2-7x-6x+21=2x^2+11x+5
2x^2-13x+21=2x^2+11x+5
11x+13x=21-5
24x=16
x=16/24 simplificam cu 
x=2/3