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Simplifying 18 + -7r = 81r + 162 Reorder the terms: 18 + -7r = 162 + 81r Solving 18 + -7r = 162 + 81r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-81r' to each side of the equation. 18 + -7r + -81r = 162 + 81r + -81r Combine like terms: -7r + -81r = -88r 18 + -88r = 162 + 81r + -81r Combine like terms: 81r + -81r = 0 18 + -88r = 162 + 0 18 + -88r = 162 Add '-18' to each side of the equation. 18 + -18 + -88r = 162 + -18 Combine like terms: 18 + -18 = 0 0 + -88r = 162 + -18 -88r = 162 + -18 Combine like terms: 162 + -18 = 144 -88r = 144 Divide each side by '-88'. r = -1.636363636 Simplifying r = -1.636363636
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