Answer:
A positive 3x
Step-by-step explanation:
since both parts have the same variable you could add them or subtract them together
(3x-7x)+(3x+4x)
You will subtract 3x-7x which will give you a negative 4x
You will do the same on the other side
Add 3x+4x and it will give you a positive 7x
-4x+7x=will give you an positive 3x
Hopes this helps
Answer: 3x
Step-by-step explanation: since they are all like terms, you start from the left in the parentheses and subtract 3x from -7x which equals -4x. Then add 3x to 4x which is 7x. Then add -4x to 7x and you get your answer which is 3x