Answer:
4x+4
Explanation:
you have to combine like-terms:
7x plus -3x which gives you 4x. All that there is left is the 4. you cant combine anything else because 4x and 4 are not like-terms. so that leaves you with 4x+4
7x -3x +4
Combine like terms
7x-3x = 4x
Substitute back into the expression
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