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Simplifying 4r + 8 + 5 = -15 + -3r Reorder the terms: 8 + 5 + 4r = -15 + -3r Combine like terms: 8 + 5 = 13 13 + 4r = -15 + -3r Solving 13 + 4r = -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. 13 + 4r + 3r = -15 + -3r + 3r Combine like terms: 4r + 3r = 7r 13 + 7r = -15 + -3r + 3r Combine like terms: -3r + 3r = 0 13 + 7r = -15 + 0 13 + 7r = -15 Add '-13' to each side of the equation. 13 + -13 + 7r = -15 + -13 Combine like terms: 13 + -13 = 0 0 + 7r = -15 + -13 7r = -15 + -13 Combine like terms: -15 + -13 = -28 7r = -28 Divide each side by '7'. r = -4 Simplifying r = -4
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