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Simplifying 15 = -9 + -4r Solving 15 = -9 + -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. 15 + 4r = -9 + -4r + 4r Combine like terms: -4r + 4r = 0 15 + 4r = -9 + 0 15 + 4r = -9 Add '-15' to each side of the equation. 15 + -15 + 4r = -9 + -15 Combine like terms: 15 + -15 = 0 0 + 4r = -9 + -15 4r = -9 + -15 Combine like terms: -9 + -15 = -24 4r = -24 Divide each side by '4'. r = -6 Simplifying r = -6
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