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x²y' - xy = 0 ; bagi x²
y' + y/(-x) = 0.............faktor integral: e^(∫ 1/(-x) dx)
e^ln x⁻¹
x⁻¹
yx⁻¹ = ∫ 0 dx + c₁
y = c₁.x
2. perjelas soalnya