Twelve is added to the product of a number and 5. The result is -3.

The unknown number is -3

Step-by-step explanation:

Represent unknown as x

Write as an equation

12 + (x * 5) = -3

Multiply

12 + 5x = -3

Subtract -5x from both sides of the equation

12 = -3 - 5x

Add 3 to both sides of the equation

15 = -5x

Divide both sides by -5

x = -3

The unknown number is -3

Hope this helps :)

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