It is known x+y=10and that x=z show that 2+y=10

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Solution

$The given equation is x + y = 10 \Rightarrow x = 10 - y . . . . . . . . (1) Also, x = 2 . . . . . . . . (2) Now, we know that, things that are equal to same thing are equal to one another . So, 10 - y = 2 or, 2 + y = 10$

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