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Simplifying -9(r + 10) = -63 Reorder the terms: -9(10 + r) = -63 (10 * -9 + r * -9) = -63 (-90 + -9r) = -63 Solving -90 + -9r = -63 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '90' to each side of the equation. -90 + 90 + -9r = -63 + 90 Combine like terms: -90 + 90 = 0 0 + -9r = -63 + 90 -9r = -63 + 90 Combine like terms: -63 + 90 = 27 -9r = 27 Divide each side by '-9'. r = -3 Simplifying r = -3
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