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2 years ago

7

15a2-6ab-8a2 - 5ab + 20+ a? - ab - 31 -

1 answer:

Crazy boy [7]2 years ago

6 0

-12ab+7a power of 2 +a 11

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zaharov [31]

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$x + y = 8 \\ x - y = 2 \\ x + y + (x - y) = 8 + 2 \\ x + y + x - y = 10 \\ 2x = 10 \\ \frac{2x}{2} = \frac{10}{2} \\ x = 5 \\ \\ x + y = 8 \\ 5 + y = 8 \\ y = 8- 5 \\ y = 3 \\ \\ x - y = 2 \\ 5 - 3 = 2 \\ 2 = 2$

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