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Simplifying 12.5 = 2(pi) * r Multiply ip * r 12.5 = 2ipr Solving 12.5 = 2ipr Solving for variable 'i'. Move all terms containing i to the left, all other terms to the right. Add '-2ipr' to each side of the equation. 12.5 + -2ipr = 2ipr + -2ipr Combine like terms: 2ipr + -2ipr = 0 12.5 + -2ipr = 0 Add '-12.5' to each side of the equation. 12.5 + -12.5 + -2ipr = 0 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + -2ipr = 0 + -12.5 -2ipr = 0 + -12.5 Combine like terms: 0 + -12.5 = -12.5 -2ipr = -12.5 Divide each side by '-2pr'. i = 6.25p^{-1}r^{-1}Simplifying i = 6.25p^{-1}r^{-1}

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