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Simplifying 5(2r + -4) = 10 Reorder the terms: 5(-4 + 2r) = 10 (-4 * 5 + 2r * 5) = 10 (-20 + 10r) = 10 Solving -20 + 10r = 10 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 10r = 10 + 20 Combine like terms: -20 + 20 = 0 0 + 10r = 10 + 20 10r = 10 + 20 Combine like terms: 10 + 20 = 30 10r = 30 Divide each side by '10'. r = 3 Simplifying r = 3
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