(2x-3)(2x+3)-x 2=12x-69+3x 2
4x 2(vtoraya stepen)+6x-6x-9-x 2(vtoraya stepen)-12x+69-3x 2(vtoraya stepen)=0
4x 2-9-x 2-12x+69-3x 2=0
60-12x=0
-12x=-60
x=5
(2x-3)(2x+3)-x 2=12x-69+3x 2
4x 2(vtoraya stepen)+6x-6x-9-x 2(vtoraya stepen)-12x+69-3x 2(vtoraya stepen)=0
4x 2-9-x 2-12x+69-3x 2=0
60-12x=0
-12x=-60
x=5