What should be done to solve the following equation?

c - 7 = 0

Add 7.
Subtract 0 from both sides.
Add 7 to both sides.
Subtract 7 from both sides.

Of four points are collinear, they are also coplanar

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

What is the answer to this equation? and if you can, find a way to show your work.