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Simplifying 13 = 12r + -5 + -3r Reorder the terms: 13 = -5 + 12r + -3r Combine like terms: 12r + -3r = 9r 13 = -5 + 9r Solving 13 = -5 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 13 + -9r = -5 + 9r + -9r Combine like terms: 9r + -9r = 0 13 + -9r = -5 + 0 13 + -9r = -5 Add '-13' to each side of the equation. 13 + -13 + -9r = -5 + -13 Combine like terms: 13 + -13 = 0 0 + -9r = -5 + -13 -9r = -5 + -13 Combine like terms: -5 + -13 = -18 -9r = -18 Divide each side by '-9'. r = 2 Simplifying r = 2
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