Question

x
$x \times (a + b) = b + a$
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Answer 1

Answer:

$x(a + b) = b + a \\ x(a+b) = (a+b) \\ x = \frac{(a + b)}{(a + b)}\\x=1$

x=1 is the right answer.

Answer 2

x(a+b)=b+a
x(a+b)=a+b
x=a+b/a+b
x=1