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Simplifying 21 = 2(pi) * r Multiply ip * r 21 = 2ipr Solving 21 = 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. 21 + -2ipr = 2ipr + -2ipr Combine like terms: 2ipr + -2ipr = 0 21 + -2ipr = 0 Add '-21' to each side of the equation. 21 + -21 + -2ipr = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -2ipr = 0 + -21 -2ipr = 0 + -21 Combine like terms: 0 + -21 = -21 -2ipr = -21 Divide each side by '-2pr'. i = 10.5p-1r-1 Simplifying i = 10.5p-1r-1
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