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Simplifying 4200 = 3500r * 12 Reorder the terms for easier multiplication: 4200 = 3500 * 12r Multiply 3500 * 12 4200 = 42000r Solving 4200 = 42000r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-42000r' to each side of the equation. 4200 + -42000r = 42000r + -42000r Combine like terms: 42000r + -42000r = 0 4200 + -42000r = 0 Add '-4200' to each side of the equation. 4200 + -4200 + -42000r = 0 + -4200 Combine like terms: 4200 + -4200 = 0 0 + -42000r = 0 + -4200 -42000r = 0 + -4200 Combine like terms: 0 + -4200 = -4200 -42000r = -4200 Divide each side by '-42000'. r = 0.1 Simplifying r = 0.1
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