The solution set consists of the infinite number of points that lie on the straight line y = -x + 7 or x + y = 7.
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It is a quadratic equation that has 2 solutions
9x2+6x-7 = 0 Using the quadratic equation formula:- x = 0.6094757082 or x = -1.276142375
That's the equation.
One solution.
This quadratic equation has no solutions because the discriminant is less than zero.