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u²v⁴-5u⁴v²=u²v²(v² - 5u²v)
u²v⁴-5u⁴v²= 5uv(⅕uv³ - u³v)
u²v⁴-5u⁴v²=-5v²(-⅕u²v⁴ + u⁴)
u²v⁴-5u⁴v²= 5uv(1/5 uv³- u³v)
u²v⁴-5u⁴v²=-5v²(-1/5u²v²+u⁴)
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