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Simplifying r * 2 + -100 = 0 Reorder the terms for easier multiplication: 2r + -100 = 0 Reorder the terms: -100 + 2r = 0 Solving -100 + 2r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '100' to each side of the equation. -100 + 100 + 2r = 0 + 100 Combine like terms: -100 + 100 = 0 0 + 2r = 0 + 100 2r = 0 + 100 Combine like terms: 0 + 100 = 100 2r = 100 Divide each side by '2'. r = 50 Simplifying r = 50
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