Question

x+7+2x-4+3x

Answer 1

You need to add all the values that include an "x" together and the values without an "x" together.

Answer 2

You need to combine like terms.
Like terms are terms that have the same variable part.
In this case, terms with x are like terms.
Terms with no x are like terms.

Answer 3

@mathstudent55 Can you help me with a problem that involves differentiation?

Answer 4

Also, keep thin in mind:
Example: 2x + 3x = 5x
x alone means 1x, so x + 2x = 1x + 2x = 3x