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Simplifying x3 + -3x2 + 7x + a = 0 Reorder the terms: a + 7x + -3x2 + x3 = 0 Solving a + 7x + -3x2 + x3 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7x' to each side of the equation. a + 7x + -3x2 + -7x + x3 = 0 + -7x Reorder the terms: a + 7x + -7x + -3x2 + x3 = 0 + -7x Combine like terms: 7x + -7x = 0 a + 0 + -3x2 + x3 = 0 + -7x a + -3x2 + x3 = 0 + -7x Remove the zero: a + -3x2 + x3 = -7x Add '3x2' to each side of the equation. a + -3x2 + 3x2 + x3 = -7x + 3x2 Combine like terms: -3x2 + 3x2 = 0 a + 0 + x3 = -7x + 3x2 a + x3 = -7x + 3x2 Add '-1x3' to each side of the equation. a + x3 + -1x3 = -7x + 3x2 + -1x3 Combine like terms: x3 + -1x3 = 0 a + 0 = -7x + 3x2 + -1x3 a = -7x + 3x2 + -1x3 Simplifying a = -7x + 3x2 + -1x3
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