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Bladerunner1976
A constant is defined as a number without a variable attacted to it.  SO in your problem, the answer would be 7
altavistard
Let's take a close look at x^2-6y+13x+7.  Add the coefficient '1' in front of the first term:  1x^2-6y+13x+7.

The numerals {1, -6} are called "coefficients."
The final numeral, 7, stands alone.  This is the "constant."