5^2x+1-5^2x-1=120 Помогите

[latex]5^{2x+1}-5^{2x-1}=120[/latex] [latex]5^{2x}*5-5^{2x}* \frac{1}{5} =120[/latex] [latex]5^{2x}*(5- \frac{1}{5}) =120[/latex] [latex]5^{2x}* \frac{25-1}{5}=120[/latex] [latex]5^{2x}* \frac{24}{5}=120[/latex] [latex]5^{2x}*24* \frac{1}{5}=120[/latex] [latex]5^{2x}* \frac{1}{5}=120:24[/latex] [latex]5^{2x-1}=5[/latex] [latex]2x-1=1[/latex] [latex]2x=2[/latex] [latex]x=1[/latex]