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Simplifying 3r + -13 = 1 + r Reorder the terms: -13 + 3r = 1 + r Solving -13 + 3r = 1 + 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. -13 + 3r + -1r = 1 + r + -1r Combine like terms: 3r + -1r = 2r -13 + 2r = 1 + r + -1r Combine like terms: r + -1r = 0 -13 + 2r = 1 + 0 -13 + 2r = 1 Add '13' to each side of the equation. -13 + 13 + 2r = 1 + 13 Combine like terms: -13 + 13 = 0 0 + 2r = 1 + 13 2r = 1 + 13 Combine like terms: 1 + 13 = 14 2r = 14 Divide each side by '2'. r = 7 Simplifying r = 7
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