a) I assume you can plug 10 into both expressions and evaluate them. Actually, as the denominators are identical.
you only have to evaluate the numerators at x=10. Do it and show they are equal at x=10.
b) what do you get in the denominator of both expressions when x = -1/2. Are we allowed to divide by this number?
c) here you have a bit of algebra to do. You need to convert the right hand side to an equivalent fraction with (2x+1) in the denominator.
Then you will see that the resulting numerators are the same.