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Simplifying 9r + -8 = -20 + 3r Reorder the terms: -8 + 9r = -20 + 3r Solving -8 + 9r = -20 + 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. -8 + 9r + -3r = -20 + 3r + -3r Combine like terms: 9r + -3r = 6r -8 + 6r = -20 + 3r + -3r Combine like terms: 3r + -3r = 0 -8 + 6r = -20 + 0 -8 + 6r = -20 Add '8' to each side of the equation. -8 + 8 + 6r = -20 + 8 Combine like terms: -8 + 8 = 0 0 + 6r = -20 + 8 6r = -20 + 8 Combine like terms: -20 + 8 = -12 6r = -12 Divide each side by '6'. r = -2 Simplifying r = -2
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