The equivalent expression to the given expression is 9x+6.
The given expression is:
5x + (x+6) +3x.
An expression is a set of terms combined by mathematical operations.
5x + (x+6) +3x
=5x+x+3x+6
=9x+6
So, equivalent expression is 9x+6.
Thus, the equivalent expression to the given expression is 9x+6.
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