Question

quanto é x/3+4x/1=39/1

Answer 1

$\frac{x}{3} + \frac{4x}{1} = \frac{39}{1} \\ \frac{x + 12x}{3} = \frac{57}{3 } \\ x + 12x = 57 \\ 13x = 57 \\ x = \frac{57}{13} \\ x = 4.38461538462$