Simplify the expression: 3y2−y2+5y3y^2 - y^2 + 5y3y2−y2+5y.
2y2+5y2y^2 + 5y2y2+5y
7y27y^27y2
4y2+5y4y^2 + 5y4y2+5y
3y2+4y3y^2 + 4y3y2+4y