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$7xy+2x−3xy−2x_{2}+x+5x_{2} $

In this expression, there are three sets of like terms, namely, $xy-terms,$ $x-terms,$ and $x_{2}-terms.$
Note that all constants are like terms. Like terms in an expression can be combined — added or subtracted — to rewrite the expression in the simplest form.

Then, like terms can be combined by adding or subtracting the coefficients of the variables as well as adding or subtracting the constants.

Now that all like terms have been combined, the initial expression, $7xy+2x−3xy−2x_{2}+x+5x_{2},$ has been reduced to its simplest form, $4xy+3x+3x_{2}.$

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