Question

A-c=r+d, for a I need to sole equationfor indicated variable.

Answer 1

Assuming that variable is r

r = a - c - d

Explanation:

Switch subject

`a-c=r+d \rightarrow r+d=a-c`

Subtract from d

`r+d-d=a-c-d`

Simplify based off of the equation

`r=a-c-d`

Hope this helps!