Решите 3 уровнения пожалуйста

1) [latex] \frac{1}{x} + \frac{3}{2 \frac{2}{5}x }= \frac{3}{4} [/latex] [latex] \frac{2 \frac{2}{5}+3 }{2 \frac{2}{5}x} = \frac{3}{4} [/latex] [latex]4(2 \frac{2}{5}+3)=3(2 \frac{2}{5}x)[/latex] [latex]\frac{108}{5}= \frac{36}{5}x [/latex] [latex]x=3[/latex] 2) [latex] \frac{1}{x} - \frac{2}{4 \frac{2}{3}x }= \frac{2}{7} [/latex] [latex] \frac{4 \frac{2}{3}-2 }{2 \frac{2}{3}x} = \frac{2}{7} [/latex] [latex]7(4 \frac{2}{3}-2)=2(4 \frac{2}{3}x)[/latex] [latex]\frac{56}{3}= \frac{28}{3}x [/latex] [latex]x=2[/latex] 3) [latex] \frac{1}{x} + \frac{6}{3 \frac{1}{3}x }= \frac{2}{5} [/latex] [latex] \frac{3 \frac{1}{3}+6 }{3 \frac{1}{3}x} = \frac{2}{5} [/latex] [latex]5(3 \frac{1}{3}+6)=2(3 \frac{1}{3}x)[/latex] [latex]\frac{140}{3}= \frac{20}{3}x [/latex] [latex]x=7[/latex]