Answer:
(a) = 3, x ≠ -7/2
Explanation:
You want the sum (and restrictions) for ...

Sum
The two terms have a common denominator, so the sum will be the sum of the numerators, divided by that denominator.

Restrictions
The domain of the expression must exclude values of x that make the expression undefined. The expression is undefined when its denominator is zero. So we require ...
2x +7 ≠ 0
2x ≠ -7
x ≠ -7/2 . . . . . the domain restriction
<95141404393>