d= fgf+g-F
Explanation:
F = fg f + g - d solve the equation for d
Solve for d means we need to get 'd' alone
To get 'd' alone we need to move all the remaining terms to the other side
F = fg f + g - d
First we subtract fgf on both sides
F - fg f = g - d
Now we subtract g on both sides
F - fg f - g = - d
now divide all the term by -1, so sign changes for all terms
-F + fgf +g = d
so d= fgf+g-F