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y*y = 11y Divide both sides by y: y = 11
y=-2
y-1/y2-y+1=y/y-1
Start with any number - say x. Pick any other number which is not 0, say y. Then, if you multiply x by y and then divide the result by y you will be back to x. Thus, "multiply by y" followed by "divide by y" is equivalent to do nothing. The first undoes the second. Also, it works in reverse in the sense that you can divide by y first and multiply by y afterwards.