Presupun ca ai vrut sa scrii:
[tex]-3x+\frac{5}{7} =0[/tex]
Se rezolva asa:
[tex]-3x+\frac{5}{7}=0\\-3x=-\frac{5}{7} \\x=\frac{5}{7}*\frac{1}{3} \\\\x=\frac{5}{21}[/tex]