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Jieep
Here is a step by step solution to your problem

3x − 5 + 5x + 1

=3x + −5+5x + 1

Combine Like Terms:

=3x + −5 + 5x + 1

=(3x + 5x) + (−5 + 1)

=8x + −4

Answer:
=8x − 4