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Simplifying -1r2 + -4 = 5 Reorder the terms: -4 + -1r2 = 5 Solving -4 + -1r2 = 5 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -1r2 = 5 + 4 Combine like terms: -4 + 4 = 0 0 + -1r2 = 5 + 4 -1r2 = 5 + 4 Combine like terms: 5 + 4 = 9 -1r2 = 9 Divide each side by '-1'. r2 = -9 Simplifying r2 = -9 Reorder the terms: 9 + r2 = -9 + 9 Combine like terms: -9 + 9 = 0 9 + r2 = 0 The solution to this equation could not be determined.
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