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Simplifying -6r + -9 + 7r = -21 Reorder the terms: -9 + -6r + 7r = -21 Combine like terms: -6r + 7r = 1r -9 + 1r = -21 Solving -9 + 1r = -21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 1r = -21 + 9 Combine like terms: -9 + 9 = 0 0 + 1r = -21 + 9 1r = -21 + 9 Combine like terms: -21 + 9 = -12 1r = -12 Divide each side by '1'. r = -12 Simplifying r = -12
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