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Simplifying 20 + -10r = -20r Solving 20 + -10r = -20r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20r' to each side of the equation. 20 + -10r + 20r = -20r + 20r Combine like terms: -10r + 20r = 10r 20 + 10r = -20r + 20r Combine like terms: -20r + 20r = 0 20 + 10r = 0 Add '-20' to each side of the equation. 20 + -20 + 10r = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 10r = 0 + -20 10r = 0 + -20 Combine like terms: 0 + -20 = -20 10r = -20 Divide each side by '10'. r = -2 Simplifying r = -2
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