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Simplifying -21 = -18r Solving -21 = -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. -21 + 18r = -18r + 18r Combine like terms: -18r + 18r = 0 -21 + 18r = 0 Add '21' to each side of the equation. -21 + 21 + 18r = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 18r = 0 + 21 18r = 0 + 21 Combine like terms: 0 + 21 = 21 18r = 21 Divide each side by '18'. r = 1.166666667 Simplifying r = 1.166666667
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