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Simplifying rx3 + 12x2 + 36x = 0 Reorder the terms: rx3 + 36x + 12x2 = 0 Solving rx3 + 36x + 12x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-36x' to each side of the equation. rx3 + 36x + -36x + 12x2 = 0 + -36x Combine like terms: 36x + -36x = 0 rx3 + 0 + 12x2 = 0 + -36x rx3 + 12x2 = 0 + -36x Remove the zero: rx3 + 12x2 = -36x Add '-12x2' to each side of the equation. rx3 + 12x2 + -12x2 = -36x + -12x2 Combine like terms: 12x2 + -12x2 = 0 rx3 + 0 = -36x + -12x2 rx3 = -36x + -12x2 Divide each side by 'x3'. r = -36x-2 + -12x-1 Simplifying r = -36x-2 + -12x-1
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