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

[" 37.If "f(2x+3y,2x-7y)=20x," then "f(x,y)" equals "],[" a."7x-3y],[" c."3x-7yquad " b."7x+3y]

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