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Simplifying 188.4 = 3.14 * 2r Multiply 3.14 * 2 188.4 = 6.28r Solving 188.4 = 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. 188.4 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 188.4 + -6.28r = 0.00 Add '-188.4' to each side of the equation. 188.4 + -188.4 + -6.28r = 0.00 + -188.4 Combine like terms: 188.4 + -188.4 = 0.0 0.0 + -6.28r = 0.00 + -188.4 -6.28r = 0.00 + -188.4 Combine like terms: 0.00 + -188.4 = -188.4 -6.28r = -188.4 Divide each side by '-6.28'. r = 30 Simplifying r = 30
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