Hello! I am needing some help on Algebra! It is hard !

Question

Can you explain how to Simplify Algebraic Expressions? The easiest way? I have a test over it Friday, and i can't understand it at all!
Can you help with these and explain?
-12z+4(z-9)+30+z
and
4(y-3)+9-3y

Answer 1

-12z+4(z-9)+30+z

Combine like terms.

-12z + 4z - 36 + 30 + z

-7z - 6

Follow the same procedure for the next problem. I'll be glad to check your answer.

Answer 2

4(y-3)+9-3y

I come out and get

4y-12+9-3y

What do I do now? I'm so confused! I don't know it !:(

Answer 3

Now combine like terms.

4y-12+9-3y

4y - 3y = y
9 - 12 = -3

4y-12+9-3y = y - 3

Answer 4

Now how would I do this? This is so confusing.

LUNCH You bought 3 pieces of chicken that cost x dollars each, a salad for $3, and a drink for $1.