There are different kinds of expression. The expressions that is equivalent to 4r + 3s - 2r is 2r +3s.
Equivalent expressions are known to be any kind of expressions that does the same thing even if they may have different looks.
Note that two algebraic expressions are said to be equivalent, when the two expressions do have the same value in terms of value(s) and variable(s).
Thus in 4r + 3s - 2r, we collect like terms:
4r -2r -3s
=2r-3s
Therefore, the answer is 2r-3s
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