So you have s=(w-10e)/5
To get rid of the 5, multiply the equation by 5, then to the other side.
So now it is 5s=w-10e
Now subtract w. So its now 5s-w=-10e
Now divide the -10. So now it is e=(5s-w)/-10
And it will not simplify because the s and w have different coefficients.
