How do you simplify #5 + 5 + 5 - 5 + 5 + 5 - 5 + 5 * 0 #?
The answer is 15, as given before. But the method can be streamlined.
In any calculation, ALWAYS count the number of terms first.
Each term must have a value. Once you have the individual values, you can just work from left to right, or you can look at all the terms and streamline the process and thinking.
There are 8 terms given here, only the last one involves a calculation. 5 x 0 = 0, so the last term can be ignored.
Remember that a + or - sign only applies to the term immediately after it. In this case there are five +5 terms and two - 5 terms, which can be written as 5 x 5 - 2 x 5. 25 - 10 = 15 is a whole lot easier than just doing one calculation in each line of working.