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(2x-3)(3x-5) = 6x^2+bx+15
6x^2-10x-9x+15 = 6x^2+bx+15
6x^2-6x^2-10x-9x-bx+15-15 = 0
--19x-bx = 0
bx = 19x
b = 19x/x
b = 19