book Maths Puzzle Numerical Ability

Solve for the indicated variable:
2/w - y = z, solve for w

This is how I solved it, I'm I correct?
1/w = z + y/2

Thanks for your help

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book Other Question

this is the question:
prove that:
(x/a)+(y/b)=1
Solve the system by graphing.

3x+y=6
3x-y=0