Solve for z A=x-y+z

$A = x - y + z$

Rewrite the equation as $x - y + z = A$ .

$x - y + z = A$

Move all terms not containing $z$ to the right side of the equation.

Subtract $x$ from both sides of the equation.

$- y + z = A - x$

Add $y$ to both sides of the equation.

$z = A - x + y$