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Simplifying 12r + 20 = -20 + 10r Reorder the terms: 20 + 12r = -20 + 10r Solving 20 + 12r = -20 + 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 + 12r + -10r = -20 + 10r + -10r Combine like terms: 12r + -10r = 2r 20 + 2r = -20 + 10r + -10r Combine like terms: 10r + -10r = 0 20 + 2r = -20 + 0 20 + 2r = -20 Add '-20' to each side of the equation. 20 + -20 + 2r = -20 + -20 Combine like terms: 20 + -20 = 0 0 + 2r = -20 + -20 2r = -20 + -20 Combine like terms: -20 + -20 = -40 2r = -40 Divide each side by '2'. r = -20 Simplifying r = -20
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