I believe its 80 if you derive it out, but there is no units of measurement.
Yes your answer is correct
Answer:
x = - 3
Step-by-step explanation:
Given
7 + x - 3 = x - 5 - 3x ( simplify both sides )
4 + x = - 2x - 5 ( add 2x to both sides )
4 + 3x = - 5 ( subtract 4 from both sides )
3x = - 9 ( divide both sides by 3 )
x = - 3
Answer: a = 
<u>Step-by-step explanation:</u>
W = 3(2a + b) - 4
W = 6a + 3b - 4
W - 3b + 4 = 6a
= a