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Simplifying 0 = x2 + 4x + Pr Reorder the terms: 0 = rP + 4x + x2 Solving 0 = rP + 4x + x2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1rP' to each side of the equation. 0 + -1rP = rP + 4x + -1rP + x2 Remove the zero: -1rP = rP + 4x + -1rP + x2 Reorder the terms: -1rP = rP + -1rP + 4x + x2 Combine like terms: rP + -1rP = 0 -1rP = 0 + 4x + x2 -1rP = 4x + x2 Divide each side by '-1P'. r = -4xP-1 + -1x2P-1 Simplifying r = -4xP-1 + -1x2P-1
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