Question

me ajudem
5x-3/10 = -21/30

Answer 1

$\frac{5x - 3}{10} = \frac{ - 21}{30} \\ 30(5x - 3) = - 21 \times 10 \\ 3(5x - 3) = - 21 \\ 5x - 3 = \frac{ - 21}{3} \\ 5x - 3 = - 7 \\ 5x = - 7 + 3 \\ 5x = - 4 \\ x = \frac{ - 4}{5} = - 0.8$