Intermediate Algebra (6th Edition)

Solution set is $\{ \}$ or $ф$.
$|\frac{5d+1}{6}| = - |-9|$ Since $|-9|$ is $9,$ $-|-9| = -9.$ Given expression becomes, $|\frac{5d+1}{6}| = -9$ The result of the absolute value is always positive or zero. So this expression has no solution. Solution set is $\{ \}$ or $ф$.