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Simplifying 648(3.14) = 2(3.14) * r(15) + 2r Multiply 648 * 3.14 2034.72 = 2(3.14) * r(15) + 2r Reorder the terms for easier multiplication: 2034.72 = 2 * 3.14 * 15r + 2r Multiply 2 * 3.14 2034.72 = 6.28 * 15r + 2r Multiply 6.28 * 15 2034.72 = 94.2r + 2r Combine like terms: 94.2r + 2r = 96.2r 2034.72 = 96.2r Solving 2034.72 = 96.2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-96.2r' to each side of the equation. 2034.72 + -96.2r = 96.2r + -96.2r Combine like terms: 96.2r + -96.2r = 0.0 2034.72 + -96.2r = 0.0 Add '-2034.72' to each side of the equation. 2034.72 + -2034.72 + -96.2r = 0.0 + -2034.72 Combine like terms: 2034.72 + -2034.72 = 0.00 0.00 + -96.2r = 0.0 + -2034.72 -96.2r = 0.0 + -2034.72 Combine like terms: 0.0 + -2034.72 = -2034.72 -96.2r = -2034.72 Divide each side by '-96.2'. r = 21.15093555 Simplifying r = 21.15093555
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