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- X + 5Y - 4X + 7 gather terms - X - 4X ( same as - X + (- 4X ) 5Y 7 = - 5X + 5Y + 7 ----------------
5y + 5y = 10y
It probably is. It is difficult to be certain because of the rubbish browser used by this site. It rejects most mathematical symbols and so it is not possible to see what, if anything, is between y5 and 10.
(27 times 18)y5 / (9 times 6)y = 486y5 / 54y = 9y4
It is 1/y5