Solve for j 3j-7j=-12

$3 j - 7 j = - 12$

Subtract $7 j$ from $3 j$ .

$- 4 j = - 12$

Divide each term in $- 4 j = - 12$ by $- 4$ and simplify.

Divide each term in $- 4 j = - 12$ by $- 4$ .

$\frac{- 4 j}{- 4} = \frac{- 12}{- 4}$

Simplify the left side.

Cancel the common factor of $- 4$ .

Cancel the common factor.

$\frac{- 4 j}{- 4} = \frac{- 12}{- 4}$

Divide $j$ by $1$ .

$j = \frac{- 12}{- 4}$

Simplify the right side.

Divide $- 12$ by $- 4$ .

$j = 3$