(2у^3+y^2-7)-(5+3y+y^3)=3y^2+y^3-5y
2y^3+3y^3-7-(5+3y+y^3)=3y^2=y^2-5y
2y^3-7-5-3y-y^3=y^3-5y
y^3-12-3y=y^3-5y
-12-3y=-5y
-3y+5y=12
2y=12
y=6
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(2у^3+y^2-7)-(5+3y+y^3)=3y^2+y^3-5y
2y^3+3y^3-7-(5+3y+y^3)=3y^2=y^2-5y
2y^3-7-5-3y-y^3=y^3-5y
y^3-12-3y=y^3-5y
-12-3y=-5y
-3y+5y=12
2y=12
y=6