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Simplifying r + -3 = 12 + -4r Reorder the terms: -3 + r = 12 + -4r Solving -3 + r = 12 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -3 + r + 4r = 12 + -4r + 4r Combine like terms: r + 4r = 5r -3 + 5r = 12 + -4r + 4r Combine like terms: -4r + 4r = 0 -3 + 5r = 12 + 0 -3 + 5r = 12 Add '3' to each side of the equation. -3 + 3 + 5r = 12 + 3 Combine like terms: -3 + 3 = 0 0 + 5r = 12 + 3 5r = 12 + 3 Combine like terms: 12 + 3 = 15 5r = 15 Divide each side by '5'. r = 3 Simplifying r = 3
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