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Simplifying 7850 = 2r * 3.14 Reorder the terms for easier multiplication: 7850 = 2 * 3.14r Multiply 2 * 3.14 7850 = 6.28r Solving 7850 = 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. 7850 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 7850 + -6.28r = 0.00 Add '-7850' to each side of the equation. 7850 + -7850 + -6.28r = 0.00 + -7850 Combine like terms: 7850 + -7850 = 0 0 + -6.28r = 0.00 + -7850 -6.28r = 0.00 + -7850 Combine like terms: 0.00 + -7850 = -7850 -6.28r = -7850 Divide each side by '-6.28'. r = 1250 Simplifying r = 1250
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