SOLUTION: i just had a math quiz about equivalent expressions. here are two problems i got wrong 4x+3=7 7x-x=7 can u you explain why my answers are not right and help me find correc

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Question 867073: i just had a math quiz about equivalent expressions. here are two problems i got wrong 4x+3=7 7x-x=7 can u you explain why my answers are not right and help me find correct equivalent expressions? it might help me understand if you use a model or make up a situation.
Answer by josgarithmetic(39617) (Show Source):
You can put this solution on YOUR website!
No need for a model for this.

Show what you did and identifying the mistake can be done.

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How do you undo everything which was done to x? Whatever you do, do the same to BOTH sides of the equation.
For this equation use these number properties:
(*) ADDITIVE Inverse of 3;
(*) Multiplicative inverse of .
I am being technical and not doing the steps for a reason. Can you do the steps?

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This one is a little different, but just like the way explained and prompted above, how do you undo what was done to x?
(*) Distributive Property but in reverse, meaning factorize the left hand expression;
(*) Simplify one of those left hand expressions;
(*) You should now have a constant multiplied by x. What is the multiplicative inverse of this constant?