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Simplifying 13 = 2r + 1 Reorder the terms: 13 = 1 + 2r Solving 13 = 1 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. 13 + -2r = 1 + 2r + -2r Combine like terms: 2r + -2r = 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 = -12 -2r = -12 Divide each side by '-2'. r = 6 Simplifying r = 6
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