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Simplifying 15 = -3r Solving 15 = -3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3r' to each side of the equation. 15 + 3r = -3r + 3r Combine like terms: -3r + 3r = 0 15 + 3r = 0 Add '-15' to each side of the equation. 15 + -15 + 3r = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 3r = 0 + -15 3r = 0 + -15 Combine like terms: 0 + -15 = -15 3r = -15 Divide each side by '3'. r = -5 Simplifying r = -5
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