is this right? someone please help :)

Answer:
it should be yes. if there are no values for A and C then yes the answer is correct.
Answer:
2a + 2c = b
Step-by-step explanation:
a = 1/2 b -c
Add c to each side
a+c = 1/2 b- c+c
a+c = 1/2 b
Multiply each side by 2
2( a+c) = 2 * 1/2 b
2a + 2c = b