Mr. Lindsay wrote the four expressions below on the board.
Expression one:
9 + 5x minus 5 + 3x
Expression 2:
10x plus 3
Expression 3:
x + 12
Expression 4:
4 (1+2x)
Which expression is equivalent to 2x + 9 - x + 3? Show your answer is correct by substituting a value for x.
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