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Simplifying 77 = 2 * 3.15r * 12 Reorder the terms for easier multiplication: 77 = 2 * 3.15 * 12r Multiply 2 * 3.15 77 = 6.3 * 12r Multiply 6.3 * 12 77 = 75.6r Solving 77 = 75.6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-75.6r' to each side of the equation. 77 + -75.6r = 75.6r + -75.6r Combine like terms: 75.6r + -75.6r = 0.0 77 + -75.6r = 0.0 Add '-77' to each side of the equation. 77 + -77 + -75.6r = 0.0 + -77 Combine like terms: 77 + -77 = 0 0 + -75.6r = 0.0 + -77 -75.6r = 0.0 + -77 Combine like terms: 0.0 + -77 = -77 -75.6r = -77 Divide each side by '-75.6'. r = 1.018518519 Simplifying r = 1.018518519
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