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Simplifying 45 = 2(3.14) * r Multiply 2 * 3.14 45 = 6.28r Solving 45 = 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. 45 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 45 + -6.28r = 0.00 Add '-45' to each side of the equation. 45 + -45 + -6.28r = 0.00 + -45 Combine like terms: 45 + -45 = 0 0 + -6.28r = 0.00 + -45 -6.28r = 0.00 + -45 Combine like terms: 0.00 + -45 = -45 -6.28r = -45 Divide each side by '-6.28'. r = 7.165605096 Simplifying r = 7.165605096
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