what must be added to10a²b + 8ab² - 8a³b³ - b⁴ to get 5a²b - 6ab² - 7a³b³
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(5a²b-6ab²-7a³b³) - (10a²b + 8ab² - 8a³b³ - b⁴)
5a²b-6ab²-7a³b³ - 10a²b-8ab²+8a³b³+b⁴
(5a²b-10a²b) + (-6ab²-8ab²) + (-7a³b³+8a³b³) + b⁴
-5a²b - 14ab² + a³b³ + b⁴
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