Question

Ab-ac/z=x solve for a

Answer 1

`(ab-ac)/(z) =x`

So firstly, you want to multiply z on both sides
`ab-ac=xz`

Next, factor out a on the left side:
`a(b-c)=xz`

Lastly, divide by b-c on both sides, and your answer will be
`a=(xz)/(b-c)`