wy - ma = ay/n for y

[math_celebrity]

wy - ma = ay/n for y

Subtract ay/n from each side:
wy - ma - ay/n = ay/n - ay/n

wy - ma - ay/n = 0

Now add ma to each side:
wy - ay/n = ma

Factor out y:
y(w - a/n) = ma

Divide each side by (w - a/n)
y = ma/(w - a/n)