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C.Simplify.Addition and Subtraction.
1.2a+5w-3a____
2.xy-7xy+3xy____
3.3(x+y)+7(x+y)___
4.(x²-7xy+y²)+(4x³+5xy-7y2)___
5..(x²-7xy+y²)-(4x³+5xy-7y2)___