Hello, scunning!

I have a compound to be made from two other compounds

. . and two pure elements: .

Compound 2 has elements in this proportion: .

Compound 3 has elements in this proportion: .

The final compound must have the following proportion of elements:

. .

So, to find the proportions needed to make compound

. . . I would need to solve the following for

. . . . . . Yes!

We have: . . . . . . . . . . .

.

. .

. . . .

Equate coefficients: .

And solve the system of equations: .

Therefore, we will use: .