Odpowiedź :
(x+2)^2 - (x+3)(x-3)= 6(x+4) - 15
x^2 + 4x + 4 - (x^2 -9)= 6x +24 - 15
x^2 + 4x + 4 - x^2 + 9= 6x + 9
4x + 13= 6x +9
4x - 6x= 9- 13
-2x= -4 /:(-2)
x= 2
(x+2)^2 - (x+3)(x-3)= 6(x+4) - 15
x^2 + 4x + 4 - (x^2 -9)= 6x +24 - 15
x^2 + 4x + 4 - x^2 + 9= 6x + 9
4x + 13= 6x +9
4x - 6x= 9- 13
-2x= -4 /:(-2)
x= 2