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Which of the following is NOT in standard form?

  1. ax+by=c

  2. ax^2+bxy+cy^2=d

  3. x^2+5x+6=0

  4. 2y-3=7x

The correct answer is: 2y-3=7x

A is in standard form because the coefficients of x and y are positive integers. B is in standard form because it has the variables and their exponents in descending order. C is not in standard form because it has a constant term on one side. D is not in standard form because it does not have the variables and their coefficients on the same side.