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Answer:
8x²-2x-2y
Step-by-step explanation:
(9x²- 10x +5y) -(7y-8x+x²)
9x²-10x+5y -7y + 8x-x²[ removing the brackets and changing the sign of the second expression]
9x²-x²-10x+8x+ 5y - 7y[ combining like terms]
8x²-2x-2y [ writing the expression in increasing order of the power of x]
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