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Simplifying 5r + -12 + -3r = 8 Reorder the terms: -12 + 5r + -3r = 8 Combine like terms: 5r + -3r = 2r -12 + 2r = 8 Solving -12 + 2r = 8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 2r = 8 + 12 Combine like terms: -12 + 12 = 0 0 + 2r = 8 + 12 2r = 8 + 12 Combine like terms: 8 + 12 = 20 2r = 20 Divide each side by '2'. r = 10 Simplifying r = 10
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