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Simplifying 10r + -20 = 2r + 20 Reorder the terms: -20 + 10r = 2r + 20 Reorder the terms: -20 + 10r = 20 + 2r Solving -20 + 10r = 20 + 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 + 10r + -2r = 20 + 2r + -2r Combine like terms: 10r + -2r = 8r -20 + 8r = 20 + 2r + -2r Combine like terms: 2r + -2r = 0 -20 + 8r = 20 + 0 -20 + 8r = 20 Add '20' to each side of the equation. -20 + 20 + 8r = 20 + 20 Combine like terms: -20 + 20 = 0 0 + 8r = 20 + 20 8r = 20 + 20 Combine like terms: 20 + 20 = 40 8r = 40 Divide each side by '8'. r = 5 Simplifying r = 5
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