# The product of number x and -6 is equal to the sum of the same number x and 21?

Dec 4, 2016

$x = - 3$

#### Explanation:

The problem can be written in algebraic form like

$\left(- 6\right) \left(x\right) = x + 21$

Solve for $x$

$- 6 x = x + 21$

$- 7 x = 21$

$x = \frac{21}{- 7}$

$x = - 3$