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Mathematics, 05.06.2020 00:01 MayFlowers

What is the missing coefficient?
(15x^2+11y^2+8x)-(7x^2+5y^2+2x) = x^2+6y^2+6x

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What is the missing coefficient?
(15x^2+11y^2+8x)-(7x^2+5y^2+2x) = x^2+6y^2+6x...
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