Question 1057855
Assuming that X and x are the same variable...


Multiplying both sides by 3 gives:


3(x - a) / x + b = 1


Multiplying both sides by x + b then gives:


3(x - a) = x + b


Distributing the 3 across the terms in parentheses gives:


3x - 3a = x + b


Adding 3a to both sides gives:


3x = x + 3a + b


Subtracting x from both sides then gives:


3x - x = 3a + b


2x = 3a + b


Dividing both sides by 2 then gives:


{{{x = (3a + b)/2}}}