Question

Enter the answer.

4.

What is the value of a?

Answer 1

http://static.k12.com/bank_packages/files/media/mathml_775c00be65f818f0d65d187ff86c2da4edd60427_1.gif

Answer 2

It's simple linear equation with one variable;) So you must destroy parenthesis; separate terms with a to left side and constants to right side.

So you get
4a = 20

thus a = 5

check with "final" solution via some web solver or make manual test of validity of this solution.

http://www.hackmath.net/en/calculator/solving-system-of-linear-equations?input=-2%28a-8%29%2B6a+%3D+36&submit=Calculate

Answer 3

thx can u help with more