Mister Exam

x1*x2+2x2*x3-3x3*x4 canonical form

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x1*x2 - 3*x3*x4 + 2*x2*x3 = 0
$$x_{1} x_{2} + 2 x_{2} x_{3} - 3 x_{3} x_{4} = 0$$
x1*x2 + 2*x2*x3 - 3*x3*x4 = 0