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Simplifying 5 = -15 + -4r Solving 5 = -15 + -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. 5 + 4r = -15 + -4r + 4r Combine like terms: -4r + 4r = 0 5 + 4r = -15 + 0 5 + 4r = -15 Add '-5' to each side of the equation. 5 + -5 + 4r = -15 + -5 Combine like terms: 5 + -5 = 0 0 + 4r = -15 + -5 4r = -15 + -5 Combine like terms: -15 + -5 = -20 4r = -20 Divide each side by '4'. r = -5 Simplifying r = -5
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