2. If x−5=16, what is x?

here
x-5=16
x=16+5
x=21

Rule: what you do to one side (of equal sign), you must do to both sides!
x −5 = 16
add 5 to both sides

x = 21

x = 21.

x = 21

that's a tough one. After half a day of calculation, the answer comes to be 21.

x = 21

x-5=16
+5=+5
x=21

x = 21

x-5=16 --> add 5 --> x = 21

x-5=16
16+5=21
X=21

21

x = 21

Add 5 to both sides.

x−5=16
x-5+5=16+5
x=21

11

X=11

Use symbolab. Why trust humans with math? It will even teach you how to get the answer better than your textbook, which is probably using the worst way for everything.