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Simplifying 12r + -18 = 13 + 18r Reorder the terms: -18 + 12r = 13 + 18r Solving -18 + 12r = 13 + 18r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-18r' to each side of the equation. -18 + 12r + -18r = 13 + 18r + -18r Combine like terms: 12r + -18r = -6r -18 + -6r = 13 + 18r + -18r Combine like terms: 18r + -18r = 0 -18 + -6r = 13 + 0 -18 + -6r = 13 Add '18' to each side of the equation. -18 + 18 + -6r = 13 + 18 Combine like terms: -18 + 18 = 0 0 + -6r = 13 + 18 -6r = 13 + 18 Combine like terms: 13 + 18 = 31 -6r = 31 Divide each side by '-6'. r = -5.166666667 Simplifying r = -5.166666667
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