Solve for b

Problem:

-7(2b-4)=5(-2b+6)

Solution:

$ \begin{eqnarray*} -7(2b-4) &=& 5(-2b+6) \\ -14b+28 &=& -10b+30 \\ 28-30 &=& -10b+14b \\ -2 &=& 4b \\ b &=& -\frac{1}{2} \end{eqnarray*} $