Question

a-n\m - a = 2y - m\m. y - ? a- ?

Answer 1

(a-n)/(m-a)=(2y-m)/m
(a-n)*m=(2y-m)*(m-a)
ma-mn=2my-m²-2ya+ma
ma-mn-ma=2my-m²-2ya
m²-mn-2my=-2ya
a=(m²-mn-2my) / (-2y) = - m(m-n-2y) /2y

m²-mn-2my=-2ya
m²-mn=2my-2ya
m²-mn=2y*(m-a)
y=(m²-mn) /2(m-a) = m(m-n)/2(m-a)