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Simplifying 20 + r = -9r Solving 20 + r = -9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9r' to each side of the equation. 20 + r + 9r = -9r + 9r Combine like terms: r + 9r = 10r 20 + 10r = -9r + 9r Combine like terms: -9r + 9r = 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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