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Simplifying 20 * 20 = 2r * 12 Multiply 20 * 20 400 = 2r * 12 Reorder the terms for easier multiplication: 400 = 2 * 12r Multiply 2 * 12 400 = 24r Solving 400 = 24r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-24r' to each side of the equation. 400 + -24r = 24r + -24r Combine like terms: 24r + -24r = 0 400 + -24r = 0 Add '-400' to each side of the equation. 400 + -400 + -24r = 0 + -400 Combine like terms: 400 + -400 = 0 0 + -24r = 0 + -400 -24r = 0 + -400 Combine like terms: 0 + -400 = -400 -24r = -400 Divide each side by '-24'. r = 16.66666667 Simplifying r = 16.66666667
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