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Simplifying -15 = 4 + 7r + -5 Reorder the terms: -15 = 4 + -5 + 7r Combine like terms: 4 + -5 = -1 -15 = -1 + 7r Solving -15 = -1 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -15 + -7r = -1 + 7r + -7r Combine like terms: 7r + -7r = 0 -15 + -7r = -1 + 0 -15 + -7r = -1 Add '15' to each side of the equation. -15 + 15 + -7r = -1 + 15 Combine like terms: -15 + 15 = 0 0 + -7r = -1 + 15 -7r = -1 + 15 Combine like terms: -1 + 15 = 14 -7r = 14 Divide each side by '-7'. r = -2 Simplifying r = -2
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