Hello,

What are the variables ?1) λχ+2y=λ

8y+λy=2λ

For this one...2) 7 + 4 = 47

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x-y x+y 15

I notice that 15=5*3

So if x-y=3 and x+y=5, you will see that it works... Perhaps there is another solution.

Else put the fractions on the same denominator and solve..