When you're simplifying equations, you have to collect the like terms (the similar ones, eg- fractions would be like terms, and so would letters). When you're simplifying, you also have to take note of the operation before the equation. 1) Firstly, collect the like terms of M (M and -4M). As M comes before -4M, you have to add -4M to M. As -4M is a negative, this overwrites the addition, and this becomes M-4M. This then gives you -3M. The same applies to the fractions, as you have -1/6 + 5/6, you have to add 5/6 to -1/6, and this gives you 4/6, or 2/3 simplified. Therefore, you put these together- and this gives you -3M + 4/6, however, you normally have a negative number second, so one this has been rearranged, this gives you 4/6-3m.
2). Same applies to this one, you also have to collect the like terms of W. 2.3W and -3W. You simply have to subtract -3W from 2.3W, and this gives you -0.7W. You now have to collect the numbers, and you have -7 and 8. 8 is a positive, therefore, you have to add 8 to -7, giving you 1. Therefore, when you collect the like terms, this gives you -0.7W+1. As aforementioned, you cannot have a negative first, so one this is rearranged, this gives you 1-0.7W
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John Lennon message in his song is saying war does not solve all problem but if you " give peace a chance" it may be a better solution to solve all the problems in war. The song also mentions the spoken parts, it is saying that the most popular subjects are all this gossip and controversial or debatable topics and opinions. The way he sees it there is no need for that sort of thing in our world. people shouldn't try not arguing and debating. As he says " give peace a chance" what's the worst that could happen.