Consider the following premises. For all x_11, x_11 will write a letter if and only if x_11 is a cashier. For all x_11, x_11 will write a letter or x_11 is not poor. For all x_11, x_11 is a cashier or x_11 is poor. Can we infer the following from them? For all x, x will write a letter.
We cannot infer that from the premises. Therefore the answer is no.