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Simplifying r2 + 5 = -10r + r2 Reorder the terms: 5 + r2 = -10r + r2 Add '-1r2' to each side of the equation. 5 + r2 + -1r2 = -10r + r2 + -1r2 Combine like terms: r2 + -1r2 = 0 5 + 0 = -10r + r2 + -1r2 5 = -10r + r2 + -1r2 Combine like terms: r2 + -1r2 = 0 5 = -10r + 0 5 = -10r Solving 5 = -10r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10r' to each side of the equation. 5 + 10r = -10r + 10r Combine like terms: -10r + 10r = 0 5 + 10r = 0 Add '-5' to each side of the equation. 5 + -5 + 10r = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 10r = 0 + -5 10r = 0 + -5 Combine like terms: 0 + -5 = -5 10r = -5 Divide each side by '10'. r = -0.5 Simplifying r = -0.5
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