subtract the following
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Step-by-step explanation:
= (7x³y- 14 x²y² + 21xy³) - ( 8x³y -32xy²+ 56x²y²)
group the similar terms,
= (7x³y - 8x³y) + (-14 x²y² -56x²y²) + (21xy³) + 32xy²
= -x³y -70x²y² +21xy³ + 32xy²
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