Answer: a = 1/(g-2)
Explanation: We must solve the equation
g = 1 + 2a/a
if the equation is as written, then a/a cancels itself, because a/a = 1, and in that case we can not solve the equation for a:
g = 1 + 2a/a = 1 + 2 = 3
if the equation is, instead:
g = (1 + 2a)/a = 1/a + 2
we can solve it for a, wich means isolating a in one side of the equation, i will do it step by step.:
g = 1/a + 2
g - 2 = 1/a
a(g - 2) = 1
a = 1/(g-2)