(5-3x)^2-0,5(2x-3)*(2x+3)=7x^2+2,525-30x+9x^2-2x^2+4.5-7x^2-2.5=0
29.5-30x+7x^2-7x^2-2.5=0
29.5-30x-2.5=0
27-30x=0
x=27/30
x=0.9
(5-3x)^2-0,5(2x-3)*(2x+3)=7x^2+2,5
25-30x+9x^2-2x^2+4.5-7x^2-2.5=0
29.5-30x+7x^2-7x^2-2.5=0
29.5-30x-2.5=0
27-30x=0
x=27/30
x=0.9