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Simplifying 12.56 = 3.14 * 2r Multiply 3.14 * 2 12.56 = 6.28r Solving 12.56 = 6.28r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6.28r' to each side of the equation. 12.56 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 12.56 + -6.28r = 0.00 Add '-12.56' to each side of the equation. 12.56 + -12.56 + -6.28r = 0.00 + -12.56 Combine like terms: 12.56 + -12.56 = 0.00 0.00 + -6.28r = 0.00 + -12.56 -6.28r = 0.00 + -12.56 Combine like terms: 0.00 + -12.56 = -12.56 -6.28r = -12.56 Divide each side by '-6.28'. r = 2 Simplifying r = 2
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