Answer:
-8
Step-by-step explanation:
First, simplifying a little, we can subtract 5 from both sides to get rid of the +5 on the left side:
-5⁄2 a + 5 = 25 -> -5/2 a = 20
Now, getting rid of the fraction, let's multiply both sides by 2:
-5/2 a = 20 -> -5a = 40
Finally, dividing both sides by -5 will isolate a, giving us the answer:
-5a = 40 -> a = -8
Edit: thanks for correction, sorry about that
