Step 1 ) Subtract 4a from both sides.
p = b + 4a + c
p - 4a = b + 4a + c - 4a
p - 4a = b + c
Step 2 ) Subtract c from both sides.
p - 4a = b + c
p - 4a - c = b + c - c
p - 4a - c = b
Step 3 ) Switch sides.
p - 4a - c = b
b = p - 4a - c
The value of b is now in its simplest form, so the value of b in p = b + 4a + c is...

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- Marlon Nunez