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Simplifying -2(5r + 15) = 400 Reorder the terms: -2(15 + 5r) = 400 (15 * -2 + 5r * -2) = 400 (-30 + -10r) = 400 Solving -30 + -10r = 400 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + -10r = 400 + 30 Combine like terms: -30 + 30 = 0 0 + -10r = 400 + 30 -10r = 400 + 30 Combine like terms: 400 + 30 = 430 -10r = 430 Divide each side by '-10'. r = -43 Simplifying r = -43
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