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Simplifying 10r + -20 = 3r + 8 Reorder the terms: -20 + 10r = 3r + 8 Reorder the terms: -20 + 10r = 8 + 3r Solving -20 + 10r = 8 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -20 + 10r + -3r = 8 + 3r + -3r Combine like terms: 10r + -3r = 7r -20 + 7r = 8 + 3r + -3r Combine like terms: 3r + -3r = 0 -20 + 7r = 8 + 0 -20 + 7r = 8 Add '20' to each side of the equation. -20 + 20 + 7r = 8 + 20 Combine like terms: -20 + 20 = 0 0 + 7r = 8 + 20 7r = 8 + 20 Combine like terms: 8 + 20 = 28 7r = 28 Divide each side by '7'. r = 4 Simplifying r = 4
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