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[" (2) For simultaneous equations in var...

[" (2) For simultaneous equations in variables "x" and "y,D_(x)=49,quad D_(y)=-63" ,"],[[D=7" then "what" is "x?," (B) "-7," (D) "(1)/(7)," (D) "(-1)/(7)]]

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For simultaneous equations in variables x and y, D_x = 49, D_y = - 63, D = 7 then what is x ?

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