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Simplifying -139 = 9R + -4 Reorder the terms: -139 = -4 + 9R Solving -139 = -4 + 9R Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Add '-9R' to each side of the equation. -139 + -9R = -4 + 9R + -9R Combine like terms: 9R + -9R = 0 -139 + -9R = -4 + 0 -139 + -9R = -4 Add '139' to each side of the equation. -139 + 139 + -9R = -4 + 139 Combine like terms: -139 + 139 = 0 0 + -9R = -4 + 139 -9R = -4 + 139 Combine like terms: -4 + 139 = 135 -9R = 135 Divide each side by '-9'. R = -15 Simplifying R = -15
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