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14*x^3+22*x^2-(((7*x)/7)*x) = 0
14*x^3+22*x^2-x^2 = 0
14*x^3+21*x^2 = 0
7*x^2*(2*x+3) = 0
2*x+3 = 0 // - 3
2*x = -3 // : 2
x = -3/2
7*x^2 = 0
7*x^2 = 0 // : 7
x^2 = 0
x = 0
x in { -3/2, 0 }
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