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Simplifying 30 + 8r = -7r Solving 30 + 8r = -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. 30 + 8r + 7r = -7r + 7r Combine like terms: 8r + 7r = 15r 30 + 15r = -7r + 7r Combine like terms: -7r + 7r = 0 30 + 15r = 0 Add '-30' to each side of the equation. 30 + -30 + 15r = 0 + -30 Combine like terms: 30 + -30 = 0 0 + 15r = 0 + -30 15r = 0 + -30 Combine like terms: 0 + -30 = -30 15r = -30 Divide each side by '15'. r = -2 Simplifying r = -2
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