5x^2 + 3y^2 - 20x + 24y = -53 complete the square on x and y
5(x^2 - 4x + 4) + 3(y^2 + 8y + 16) = -53 + 20 + 48
5(x - 2)^2 + 3 (y + 4)^2 = 15 divide both sides by 15
(x - 2)^2 / 3 + (y + 4)^2 / 5 = 1
This is an ellipse centered at ( 2 , -4) with a major axis length of 2sqrt(5) and a minor axis length of 2sqrt(3)
Here's the graph : https://www.desmos.com/calculator/kklcz1gncn
