Hey there!
The first expression is
5x+15
The equivalent expressions are
5(x+3)
- the opposite of the Distributive Property: 5(x+3)=5x+15
Plus
isn't 5*x+5*3 the same as 5x+15?
Yeah, it is :)
Hence, the equivalent expressions are


In order to simplify this expression, we need to combine like terms:
11+12y-3-y
The y's are like terms:
11+12y-y-3
11+11y-3
Can you spot any other like terms here? That's right, 11 and -3:
11-3+11y
8+11y
Hence, the equivalent expression is

Hope everything is clear.
Let me know if you have any other questions; if so, please comment.
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