I’m pretty sure the answer is 3 because the z stands for a missing number so 2+3=5
Simplify both sides of the equation.
2+-z=5
-z+2=5
Subtract 2 from both sides.
-z+2-2=5-2
-z=3
Divide both sides by -1
-z = 3
-1 = -1
z=-3
