The viewers need to make sure to multiply the denominators by the right factors or else the equation will not be correct. The viewers all need to separate each grouping correctly because you will later on take out the variables and if something is missing or out of place, your equation will be wrong. Using a matrix to show your work would be to much of a hassel so instead we use substitution and canceling to find one of the variables. After doing that, the viwers should remember to subsitute their answers for the variables into the equation to find the other vairables. After getting all the variables, you plug it in the original equation "A/(x-2) + B/(x+1) + C/(x+1)^2 + D/(x+1)^3" and that will be your answer.
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