Question

To solve 2x+9=21, what is the first step?

Answer 1

That would be to collect like terms

Explanation:

Further explanation

`2x+9=21\\\\Collect\: like\: terms\\2x = 21-9\\\\Simplify\\2x = 12\\\\Divide\:both\:sides\:of\:the\:equation\:by\:2\\(2x)/(2) = (12)/(2) \\Simplify\\\\x =6`

Answer 2

The first step is to subtract 9 from each side

Explanation:

2x+9=21

The first step is to subtract 9 from each side

2x+9-9 = 21-9

2x = 12

Then divide by 2 on each side

2x/2 = 12/2

x = 6