Question

which of the following describes the correct process for solving the equation 3x+6=21 and arrives at the correct solution?

Answer 1

To solve the equation 3x + 6 = 21, follow the following steps.

Step 1: Collect like terms

"6" crosses the equality sign to the right and becomes "-6"

3x = 21 - 6

Step 2: Simplify the expression in step 1

Note that 21 - 6 = 15

The equation becomes:

3x = 15

Step 3: Divide both sides 3

The equation becomes

3x / 3 = 15/3

x = 5