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Simplifying rx2 + -4x + a = 0 Reorder the terms: a + rx2 + -4x = 0 Solving a + rx2 + -4x = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1rx2' to each side of the equation. a + rx2 + -1rx2 + -4x = 0 + -1rx2 Combine like terms: rx2 + -1rx2 = 0 a + 0 + -4x = 0 + -1rx2 a + -4x = 0 + -1rx2 Remove the zero: a + -4x = -1rx2 Add '4x' to each side of the equation. a + -4x + 4x = -1rx2 + 4x Combine like terms: -4x + 4x = 0 a + 0 = -1rx2 + 4x a = -1rx2 + 4x Simplifying a = -1rx2 + 4x
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