![image](https://tex.z-dn.net/?f=+%5Csqrt%7B51-13x%7D%3D5%5C%5C51-13x%3E0%5C%5C13x%3C51%5C%5Cx%3C51%2F13%5C%5Cx%3C3+%5Cfrac%7B12%7D%7B13%7D%5C%5C%5C%5C51-13x%3D5%5E2%5C%5C51-13x%3D25%5C%5C13x%3D51-25%5C%5C13x%3D26%5C%5Cx%3D26%3A13%5C%5Cx%3D2%28%3C++3+%5Cfrac%7B12%7D%7B13%7D%29%5C%5C%5C%5Cx%3D2)
0\\13x<51\\x<51/13\\x<3 \frac{12}{13}\\\\51-13x=5^2\\51-13x=25\\13x=51-25\\13x=26\\x=26:13\\x=2(< 3 \frac{12}{13})\\\\x=2" alt=" \sqrt{51-13x}=5\\51-13x>0\\13x<51\\x<51/13\\x<3 \frac{12}{13}\\\\51-13x=5^2\\51-13x=25\\13x=51-25\\13x=26\\x=26:13\\x=2(< 3 \frac{12}{13})\\\\x=2" align="absmiddle" class="latex-formula">