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Simplifying 13r + 1 = 3r + -19 Reorder the terms: 1 + 13r = 3r + -19 Reorder the terms: 1 + 13r = -19 + 3r Solving 1 + 13r = -19 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 1 + 13r + -3r = -19 + 3r + -3r Combine like terms: 13r + -3r = 10r 1 + 10r = -19 + 3r + -3r Combine like terms: 3r + -3r = 0 1 + 10r = -19 + 0 1 + 10r = -19 Add '-1' to each side of the equation. 1 + -1 + 10r = -19 + -1 Combine like terms: 1 + -1 = 0 0 + 10r = -19 + -1 10r = -19 + -1 Combine like terms: -19 + -1 = -20 10r = -20 Divide each side by '10'. r = -2 Simplifying r = -2
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