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Simplifying r + -7 = -7r + 9 Reorder the terms: -7 + r = -7r + 9 Reorder the terms: -7 + r = 9 + -7r Solving -7 + r = 9 + -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. -7 + r + 7r = 9 + -7r + 7r Combine like terms: r + 7r = 8r -7 + 8r = 9 + -7r + 7r Combine like terms: -7r + 7r = 0 -7 + 8r = 9 + 0 -7 + 8r = 9 Add '7' to each side of the equation. -7 + 7 + 8r = 9 + 7 Combine like terms: -7 + 7 = 0 0 + 8r = 9 + 7 8r = 9 + 7 Combine like terms: 9 + 7 = 16 8r = 16 Divide each side by '8'. r = 2 Simplifying r = 2
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