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Simplifying -2(r + 9) = -39 Reorder the terms: -2(9 + r) = -39 (9 * -2 + r * -2) = -39 (-18 + -2r) = -39 Solving -18 + -2r = -39 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -2r = -39 + 18 Combine like terms: -18 + 18 = 0 0 + -2r = -39 + 18 -2r = -39 + 18 Combine like terms: -39 + 18 = -21 -2r = -21 Divide each side by '-2'. r = 10.5 Simplifying r = 10.5
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