103k views
9 votes
3X+ 9 = 21
I need to find X

User Ninoorta
by
8.9k points

2 Answers

10 votes

Answer:

x = 4

Explanation:

Subtract 9 from both sides which gives 3x = 12 then divide each side by 3 and you get x = 4

User TaylorMac
by
8.4k points
9 votes

Answer:


  • \Large\boxed{\sf{x=4}}

Explanation:

You have to find the value of x, to isolate it on one side of the equation.


\sf{3x+9=21}

First, you have to subtract by 9 from both sides.


\sf{3x+9-9=21-9}

Solve.


Subtract.

21-9=12

Rewrite the problem down.

3x=12

Then, you divide by 3 from both sides.

3x/3=12/3

Solve.


Divide the numbers from left to right.

12/3=4


\Longrightarrow: \boxed{\sf{x=4}}

The answer should have a "positive sign".

  • Therefore, the correct answer is x=4.

I hope this helps, let me know if you have any questions.

User Xaphod
by
8.8k points

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