4=\frac{x}{5}- \frac{x}{3};
4=\frac{3x}{15}- \frac{5x}{15};
4=\frac{-2x}{15};
-2x=4*15;
x=60/-2=-30" alt="4+ \frac{x}{3} = \frac{x}{5} ;
4=\frac{x}{5}- \frac{x}{3};
4=\frac{3x}{15}- \frac{5x}{15};
4=\frac{-2x}{15};
-2x=4*15;
x=60/-2=-30" align="absmiddle" class="latex-formula">