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Simplifying 5(2r + -5) = 55 Reorder the terms: 5(-5 + 2r) = 55 (-5 * 5 + 2r * 5) = 55 (-25 + 10r) = 55 Solving -25 + 10r = 55 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + 10r = 55 + 25 Combine like terms: -25 + 25 = 0 0 + 10r = 55 + 25 10r = 55 + 25 Combine like terms: 55 + 25 = 80 10r = 80 Divide each side by '10'. r = 8 Simplifying r = 8
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