Answer:
u=2/2a-1
Step-by-step explanation:
a=1/u +1/2
you find the LCM first which is 2u
a=2+u/2u
cross multiply
2au=2+u
subtract u from both sides
2au-u=2
u is common to the right hand side
u(2a-1)=2
divide through by 2a-1
