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Simplifying 3r + -1(-18r) = 0 Remove parenthesis around (-18r) 3r + -1 * -18r = 0 Multiply -1 * -18 3r + 18r = 0 Combine like terms: 3r + 18r = 21r 21r = 0 Solving 21r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '21'. r = 0 Simplifying r = 0
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