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Simplifying 3.5(5r + -1) + 3.5r = 0 Reorder the terms: 3.5(-1 + 5r) + 3.5r = 0 (-1 * 3.5 + 5r * 3.5) + 3.5r = 0 (-3.5 + 17.5r) + 3.5r = 0 Combine like terms: 17.5r + 3.5r = 21r -3.5 + 21r = 0 Solving -3.5 + 21r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + 21r = 0 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + 21r = 0 + 3.5 21r = 0 + 3.5 Combine like terms: 0 + 3.5 = 3.5 21r = 3.5 Divide each side by '21'. r = 0.1666666667 Simplifying r = 0.1666666667
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