64y-4y^3=04y^3-64y=0y^3-16y=0y(y^2-16)=0y(y-4)(y+4)=0y=0 ; y=4; y=-4
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64y-4y^3=0
4y^3-64y=0
y^3-16y=0
y(y^2-16)=0
y(y-4)(y+4)=0
y=0 ; y=4; y=-4