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Simplifying 2(5r + -4) = 0 Reorder the terms: 2(-4 + 5r) = 0 (-4 * 2 + 5r * 2) = 0 (-8 + 10r) = 0 Solving -8 + 10r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 10r = 0 + 8 Combine like terms: -8 + 8 = 0 0 + 10r = 0 + 8 10r = 0 + 8 Combine like terms: 0 + 8 = 8 10r = 8 Divide each side by '10'. r = 0.8 Simplifying r = 0.8
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