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Simplifying -18 = r + 3 + -8r Reorder the terms: -18 = 3 + r + -8r Combine like terms: r + -8r = -7r -18 = 3 + -7r Solving -18 = 3 + -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. -18 + 7r = 3 + -7r + 7r Combine like terms: -7r + 7r = 0 -18 + 7r = 3 + 0 -18 + 7r = 3 Add '18' to each side of the equation. -18 + 18 + 7r = 3 + 18 Combine like terms: -18 + 18 = 0 0 + 7r = 3 + 18 7r = 3 + 18 Combine like terms: 3 + 18 = 21 7r = 21 Divide each side by '7'. r = 3 Simplifying r = 3
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