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Simplifying 8r + -4(7 + -5r) = 0 8r + (7 * -4 + -5r * -4) = 0 8r + (-28 + 20r) = 0 Reorder the terms: -28 + 8r + 20r = 0 Combine like terms: 8r + 20r = 28r -28 + 28r = 0 Solving -28 + 28r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 28r = 0 + 28 Combine like terms: -28 + 28 = 0 0 + 28r = 0 + 28 28r = 0 + 28 Combine like terms: 0 + 28 = 28 28r = 28 Divide each side by '28'. r = 1 Simplifying r = 1
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