0;\ x\neq2\\
lgx-4=0\\
lgx=4\\
lgx=lg10^4\\
x=10^4=10000\\" alt="b)\ (\frac{1}{64})^x=\sqrt{\frac{1}{2}}\\
((\frac{1}{\sqrt2})^{12})^x=\frac{1}{\sqrt2}\\
(\frac{1}{\sqrt2})^{12x}=\frac{1}{\sqrt2}\\
12x=1\\
x=\frac{1}{12}\\
v)\ 2^{x^2-8x+19}=16\\
2^{x^2-8x+19}=2^4\\
x^2-8x+19=4\\
x^2-8x+15=0\\
|x=3\\
|x=5\\
g)\ \frac{lgx-4}{2-x}=0\\
x>0;\ x\neq2\\
lgx-4=0\\
lgx=4\\
lgx=lg10^4\\
x=10^4=10000\\" align="absmiddle" class="latex-formula">