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Simplifying 5(2r + -2) = 20 Reorder the terms: 5(-2 + 2r) = 20 (-2 * 5 + 2r * 5) = 20 (-10 + 10r) = 20 Solving -10 + 10r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 10r = 20 + 10 Combine like terms: -10 + 10 = 0 0 + 10r = 20 + 10 10r = 20 + 10 Combine like terms: 20 + 10 = 30 10r = 30 Divide each side by '10'. r = 3 Simplifying r = 3
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