Solve for x -x-15-3x=x

$- x - 15 - 3 x = x$

Step 1

Subtract $3 x$ from $- x$ .

$- 4 x - 15 = x$

Step 2

Move all terms containing $x$ to the left side of the equation.

Subtract $x$ from both sides of the equation.

$- 4 x - 15 - x = 0$

Subtract $x$ from $- 4 x$ .

$- 5 x - 15 = 0$

Step 3

Add $15$ to both sides of the equation.

$- 5 x = 15$

Step 4

Divide each term in $- 5 x = 15$ by $- 5$ and simplify.

Divide each term in $- 5 x = 15$ by $- 5$ .

$\frac{- 5 x}{- 5} = \frac{15}{- 5}$

Simplify the left side.

Cancel the common factor of $- 5$ .

Cancel the common factor.

$\frac{- 5 x}{- 5} = \frac{15}{- 5}$

Divide $x$ by $1$ .

$x = \frac{15}{- 5}$

Simplify the right side.

Divide $15$ by $- 5$ .

$x = - 3$