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2a² + a²b³ + A = 8a² - 15a²b³ - 6a³b²
A = 8a² - 15a²b³ - 6a³b² - 2a² - a²b³
A = 6a² - 16a²b³ - 6a³b²
b.
-3x²y + 2xy³ - A = x²y + 6xy³ - 2xy
A = -3x²y + 2xy³ - x²y - 6xy³ + 2xy
A = -4x²y - 4xy³ + 2xy