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5x2+ 7x + 2 = (x + 1)(5x + 2).
If you mean 5x^2 -7x +2 = 0 then it is a quadratic equation with solutions of x = 2/5 or x = 1
7x + 2
5x + 17 = 7x - 123 123 + 17 = 7x - 5x 140 = 2x x = 140 ÷ 2 x = 70
35x^2 + 77x + 42