Hi :)
Let's make 
 the subject of the formula. This is exactly the same as solving the equation for
 the subject of the formula. This is exactly the same as solving the equation for 
 .
.
This is how we'll go about finding 
 :
:
W=2a+3b
Let's get 2a out of the way by subtracting both sides by 
 :
:
W-2a=3b
Now just divide the whole equation by 


We can turn this around. It won't change anything, as long as these two sides are equal

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