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the second one is the answermy teacher said all u do is flip the sign is what she thinks

That makes no sense though?

idk thats what she said i got done with tht lessom and didnt understand it either sorry

No problem, can anyone explain this?

subtract 4 on both sides.

Well.... that was simple enough.
So do I just subtract the number on the left every time?

well depends on the question .. normally u ahve to isolate the variable.