separation of variables

how do you separate these variables dy/dx=1/y^2, y(0)=4

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  1. y^2 dy = dx
    (1/3) y^3 = x + c
    but (0,4) is on it so
    (1/3)(4^3) = c
    c = 64/3
    y^3/3 = x + 64/3
    y^3 = 3 x + 64

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