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(2x + 1) (x + 3) = 2x2 + 7x + 3
2x + 5x - 1 = 9x 7x - 1 = 9x -1 = 9x - 7x -1 = 2x -1/2=x
if its 3x3 - 2x + 1 then its a cubic trinomial
(3x - 1) + 7 = (7x - 2x) + x3x - 1 + 7 = 7x - 2x + x3x + 6 = 6x6 = 3xx = 6/3 = 2
5x2+ 7x + 2 = (x + 1)(5x + 2).