Book Maths Puzzle Algebra

How do i simplify the expression by combining like terms for
10x-4y-25x+6y
2/3a+3/5a-1/2b+2/3 ?

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Book Other Question

Tell relationship between the x- and y- values. I have to make a equation for the following values.
x y
5 11
Is there a easy way to figure out the How do i simplify the expression by combining like terms?
uv to the 2nd + 10-2uv to the 2nd +2