Question

hello friends it's very urgent
solutions please

Answer 1

Here is your solution

$\frac{0.4z - 3}{1.5z + 9} = \frac{7}{5} \\ \\ 0.20z - 15 = 10.5z + 63 \\ 0.20z - 10.5z = 63 + 15 \\ - 10.3z = 78 \\ z = \frac{78}{ - 10.3} \\ \\ z = - \frac{78 \times 10}{103} \\ \\ z= - 7.57$