Answer:
x
=
21/2
Step-by-step explanation:
Move all terms not containing x to the right side of the equation.
3x=x+21
Move all terms containing x to the left side of the equation.
2x=21
Divide each term by
2
and simplify.
x
=
21/2
If i’m not dumb i think it’s the last one
Use Photomath it will probably help
12 times 3 is equal to 36 so 36 is your answer