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Simplifying 78.5 = 2(3.14) * r Multiply 2 * 3.14 78.5 = 6.28r Solving 78.5 = 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. 78.5 + -6.28r = 6.28r + -6.28r Combine like terms: 6.28r + -6.28r = 0.00 78.5 + -6.28r = 0.00 Add '-78.5' to each side of the equation. 78.5 + -78.5 + -6.28r = 0.00 + -78.5 Combine like terms: 78.5 + -78.5 = 0.0 0.0 + -6.28r = 0.00 + -78.5 -6.28r = 0.00 + -78.5 Combine like terms: 0.00 + -78.5 = -78.5 -6.28r = -78.5 Divide each side by '-6.28'. r = 12.5 Simplifying r = 12.5
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