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Simplifying rx3 + 5x2 + 4x + 20 = 0 Reorder the terms: 20 + rx3 + 4x + 5x2 = 0 Solving 20 + rx3 + 4x + 5x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + rx3 + 4x + -20 + 5x2 = 0 + -20 Reorder the terms: 20 + -20 + rx3 + 4x + 5x2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + rx3 + 4x + 5x2 = 0 + -20 rx3 + 4x + 5x2 = 0 + -20 Combine like terms: 0 + -20 = -20 rx3 + 4x + 5x2 = -20 Add '-4x' to each side of the equation. rx3 + 4x + -4x + 5x2 = -20 + -4x Combine like terms: 4x + -4x = 0 rx3 + 0 + 5x2 = -20 + -4x rx3 + 5x2 = -20 + -4x Add '-5x2' to each side of the equation. rx3 + 5x2 + -5x2 = -20 + -4x + -5x2 Combine like terms: 5x2 + -5x2 = 0 rx3 + 0 = -20 + -4x + -5x2 rx3 = -20 + -4x + -5x2 Divide each side by 'x3'. r = -20x-3 + -4x-2 + -5x-1 Simplifying r = -20x-3 + -4x-2 + -5x-1
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