+821 What are the $x$-coordinate(s) of all point(s) where the parabola $y = f(x)$ intersects the line $y = 0$?
f(x) = 2x^2 - 13x + 20 - 5x^2 + 19x + 7.
Your answer should be a list of numbers and should not include variable names, nor should it include $y$-coordinates.
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