Simplify 4y+5y^2-6-5y+27-y^2

$4 y + 5 y^{2} - 6 - 5 y + 27 - y^{2}$

Subtract $5 y$ from $4 y$ .

$- y + 5 y^{2} - 6 + 27 - y^{2}$

Subtract $y^{2}$ from $5 y^{2}$ .

$- y + 4 y^{2} - 6 + 27$

Simplify the expression.

Add $- 6$ and $27$ .

$- y + 4 y^{2} + 21$

Reorder $- y$ and $4 y^{2}$ .

$4 y^{2} - y + 21$

$4 y^{2} - y + 21$

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