What is the prime number​

A prime number is a number that's only factors are one and itself.  

Step-by-step explanation:

For example, the number 17.  There are no 2 numbers other than 1 and 17 that can be multiplied together to get 17.  However, the number 4 has many factors: 1,4 and 2,2.  Because there are more factors then just 4 and 1, this number is not prime; it is composite.  

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x