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Simplifying -20 = 10 + 10r Solving -20 = 10 + 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. -20 + -10r = 10 + 10r + -10r Combine like terms: 10r + -10r = 0 -20 + -10r = 10 + 0 -20 + -10r = 10 Add '20' to each side of the equation. -20 + 20 + -10r = 10 + 20 Combine like terms: -20 + 20 = 0 0 + -10r = 10 + 20 -10r = 10 + 20 Combine like terms: 10 + 20 = 30 -10r = 30 Divide each side by '-10'. r = -3 Simplifying r = -3
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