1)1/(lg(x)+3)+2/(3-lg(x))=1 2)(log3x)^2-1/2*log3x^2=2 1/(lg(x)+3)+2/(3-lg(x))=1 7^x-2^(x+2)=5*7^(x-1)-2^(x-1) x^(log3(x-4))=1/27 logx(9x^2)*(log3x)^2=4

[latex]7^{x}-2^{x+2}=5*7^{x-1}-2^{x-1} [/latex] [latex]7^{x}-4*2^{x}=5* \frac{1}{7}* 7^{x}- \frac{1}{2}* 2^{x} [/latex] [latex]7^{x}-\frac{5}{7}* 7^{x}=4*2^{x}- \frac{1}{2}* 2^{x} [/latex] [latex]7^{x}(1-\frac{5}{7})=2^{x}(4- \frac{1}{2}) [/latex] [latex]7^{x}*\frac{2}{7}=2^{x}* \frac{7}{2} [/latex] [latex]\frac{7^{x}}{2^{x}}= \frac{49}{4} [/latex] [latex](\frac{7}{2})^{x} = (\frac{7}{2})^{2} [/latex] x=2