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Simplifying -7r + -8r + 30 = -15 Reorder the terms: 30 + -7r + -8r = -15 Combine like terms: -7r + -8r = -15r 30 + -15r = -15 Solving 30 + -15r = -15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + -15r = -15 + -30 Combine like terms: 30 + -30 = 0 0 + -15r = -15 + -30 -15r = -15 + -30 Combine like terms: -15 + -30 = -45 -15r = -45 Divide each side by '-15'. r = 3 Simplifying r = 3
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