What is the simplified form of 5x + 3x - 4?

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To simplify the expression 5x + 3x - 4, start by combining the like terms, which are the terms involving x.

When you add 5x and 3x, you get:

5x + 3x = 8x.

The -4 is a constant term and does not combine with the terms that include x. Therefore, the expression now reads:

8x - 4.

This is the simplified form of the original expression. The correct answer reflects this simplification correctly as 8x - 4.