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Simplifying 2(8r + r) = -4r Combine like terms: 8r + r = 9r 2(9r) = -4r Remove parenthesis around (9r) 2 * 9r = -4r Multiply 2 * 9 18r = -4r Solving 18r = -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. 18r + 4r = -4r + 4r Combine like terms: 18r + 4r = 22r 22r = -4r + 4r Combine like terms: -4r + 4r = 0 22r = 0 Divide each side by '22'. r = 0 Simplifying r = 0
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