The expression is 3x- 1.
An expression is a set of terms combined using the operations +, – , x or /.
Given:
6 +(–x) + 2x + (–7) + 2x
= 6 - x + 2x - 7 + 2x
=-x+ 4x +- 1
= 3x - 1
Hence, the equivalent expression is 3x- 1.
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