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Simplifying 12r + -20 = 2r Reorder the terms: -20 + 12r = 2r Solving -20 + 12r = 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -20 + 12r + -2r = 2r + -2r Combine like terms: 12r + -2r = 10r -20 + 10r = 2r + -2r Combine like terms: 2r + -2r = 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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