*Tips:*(1) The equation must have one constant (without x and y).

(2)

**X**and

**Y**cannot have constant, but can have the variables (for example x and y).

(3)

**and**

*m***can only have the constant(for example a and b), cannot have the variables x and y.**

*c*(1) The equation must have one constant (without x and y).

(2)

(3)

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