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Simplifying 3r + -1 = r + 8 Reorder the terms: -1 + 3r = r + 8 Reorder the terms: -1 + 3r = 8 + r Solving -1 + 3r = 8 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -1 + 3r + -1r = 8 + r + -1r Combine like terms: 3r + -1r = 2r -1 + 2r = 8 + r + -1r Combine like terms: r + -1r = 0 -1 + 2r = 8 + 0 -1 + 2r = 8 Add '1' to each side of the equation. -1 + 1 + 2r = 8 + 1 Combine like terms: -1 + 1 = 0 0 + 2r = 8 + 1 2r = 8 + 1 Combine like terms: 8 + 1 = 9 2r = 9 Divide each side by '2'. r = 4.5 Simplifying r = 4.5
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