Book Maths Puzzle Algebra

How do i simplify the expression by combining like terms?
uv to the 2nd + 10-2uv to the 2nd +2

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Book Other Question

How do i simplify the expression by combining like terms for
10x-4y-25x+6y
2/3a+3/5a-1/2b+2/3 ?
what is the total cost for a family to stay one night at a campground if the charge is $18 for the parents plus $3 for each of the children?