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Simplifying -9 + -18r = -171 Solving -9 + -18r = -171 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -18r = -171 + 9 Combine like terms: -9 + 9 = 0 0 + -18r = -171 + 9 -18r = -171 + 9 Combine like terms: -171 + 9 = -162 -18r = -162 Divide each side by '-18'. r = 9 Simplifying r = 9
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