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Simplifying 12 + -18 = 13r + 18 Combine like terms: 12 + -18 = -6 -6 = 13r + 18 Reorder the terms: -6 = 18 + 13r Solving -6 = 18 + 13r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-13r' to each side of the equation. -6 + -13r = 18 + 13r + -13r Combine like terms: 13r + -13r = 0 -6 + -13r = 18 + 0 -6 + -13r = 18 Add '6' to each side of the equation. -6 + 6 + -13r = 18 + 6 Combine like terms: -6 + 6 = 0 0 + -13r = 18 + 6 -13r = 18 + 6 Combine like terms: 18 + 6 = 24 -13r = 24 Divide each side by '-13'. r = -1.846153846 Simplifying r = -1.846153846
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