Create an equation to represent the following phrase: the sum of twice a number and six.
The equation to represent the phrase "the sum of twice a number and six" can be written as:

2x + 6 = 0, where x is the unknown number.
Complete the following task based on the instruction and optional input provided.### Instruction:
Create an equation to represent the following phrase: the sum of twice a number and six.

### Output:
The equation to represent the phrase "the sum of twice a number and six" can be written as:

2x + 6 = 0, where x is the unknown number.