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[" If "f(2x+3y,2x-7y)=20x," then "f(x,y)...

[" If "f(2x+3y,2x-7y)=20x," then "f(x,y)],[" equals "--1" ."]

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If f(2x+3y ,2x-7y)=20 x ,t h e nf(x , y)e q u a l sdot 7x-3y 7x+3y 3x-7y (d) x-k y