Question

--y*2y-1+3y^2-y*5+7y^2*y+3
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Answer 1

$-y*2y-1+3y^2-y*5+7y^2*y+3 = \=7y^3-2y^2+3y^2-5y+2 = 7y^3+y^2-5y+2$

Answer 2

-y * 2y - 1 + 3y² - y * 5 + 7y² * y + 3 = - 2y² - 1 + 3y² - 5y + 7y³ + 3 =
= 7y³ + y² - 5y + 2