(Add) 5x²+6xy 7yz + 10 and 8x²-9xy 10yz - 10
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(5x²+6xy7yz+10) + (8x²-9xy10yz-10)
= 5x²+6xy7yz+10+8x²+9xy10yz+10
= 5x²+8x²+6xy7yz+9xy10yz+10+10
= 13x²+15xy17yz+20
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