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
From the same store, Anne bought 3 loaves of bread and 2 bottles of milk for $15.30, and Joe bought 2 loaves of bread and a bottle of milk for $9.20. What is the price for one of each? {{{y=(1/2)x+1}}} the distance of the point (3,0)?