Question

resolva a questao x/5+x/2=3

Answer 1

MMC=5 2x/10+5x/10=30/10 7x=30 X=30/7=~4,29

Answer 2

$\dfrac{x}{5} + \dfrac{x}{2} =3 \to~~~mmc(5,2)=10\\\\ 2x + 5x = 30\to\\\\ 7x = 30\to\\\\ \large\boxed{x = \dfrac{30}{7} }$