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Simplifying 188.4 = 4r * 3.14 Reorder the terms for easier multiplication: 188.4 = 4 * 3.14r Multiply 4 * 3.14 188.4 = 12.56r Solving 188.4 = 12.56r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-12.56r' to each side of the equation. 188.4 + -12.56r = 12.56r + -12.56r Combine like terms: 12.56r + -12.56r = 0.00 188.4 + -12.56r = 0.00 Add '-188.4' to each side of the equation. 188.4 + -188.4 + -12.56r = 0.00 + -188.4 Combine like terms: 188.4 + -188.4 = 0.0 0.0 + -12.56r = 0.00 + -188.4 -12.56r = 0.00 + -188.4 Combine like terms: 0.00 + -188.4 = -188.4 -12.56r = -188.4 Divide each side by '-12.56'. r = 15 Simplifying r = 15
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