PEMDAS<span> is a word for Parenthesis Exponents Multiplication Division Addition Subtraction.</span>
First we multiply 2r*r and it gives us

.
Then -5r, + 20r = 15r
Then -5*10 gives us -50.
So the answer is:
Z = y + 10
I’m not sure if this is the equation you are looking for, but saying that “Z” is equal to “y + 10” is like saying that “Z” is greater than “y” by ten.
I hope this helped! ☻
Answer:
Two ways you can group them is:
(4+7)+2
4+(7+2)
They will both give you the same answer of 13.
(4+7)+2 4+(7+2)
11+2= 13 4+9= 13