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the number you have is 100% of your sales price (the sales price itself) plus 7% of your sales price (the tax), so you can think of it as 1.07 times the sales price (107% of the sales price). If P is the sales price, we get:
1.07P = 6645.16
simply solve for P by dividing by 1.07:
As Taylor and Kristen have said, the key to solving this problem is to understand that when you subtract a negative number, you are doing the same thing as adding a positive number, so "-(-34)" is the same as +34. The two ways I suggest you remember this
1) Visually: when...