plz solve a urgent brainliest question
6. Subtract the sum of 3x^2y - 5a + 4b and -9x^2y - 7b+ 4a from their difference.
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3x²y-5a+4b-(-9x²y-7b+4a)
3x²y-5a+4b+9x²y+7b-4a
12x²y-9a+11b
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