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Simplifying 90 = -18r Solving 90 = -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. 90 + 18r = -18r + 18r Combine like terms: -18r + 18r = 0 90 + 18r = 0 Add '-90' to each side of the equation. 90 + -90 + 18r = 0 + -90 Combine like terms: 90 + -90 = 0 0 + 18r = 0 + -90 18r = 0 + -90 Combine like terms: 0 + -90 = -90 18r = -90 Divide each side by '18'. r = -5 Simplifying r = -5
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