Question

X+8=21 I need helpppp

Answer 1

You add 13 and 8 it gets 21 so for X its 13

Answer 2

X = 13.

Because you want x by itself, to need to remove the +8. So, you must do the opposite to BOTH sides. The opposite of +8 is -8, and 21-8=13. Therefore​, x=13.